XCOM File Transfer - iLink

Transcription

XCOM File Transfer
Specification
Version 1.6
1 Sep 2015
XCOM File Transfer – Specification
Date
Version
Description
14-Dec-2010
1.0
Original Version
5-Jan-2011
1.1
Updated
29-Mar-2011
1.2
Corrected key generation
14-Aug-2012
1.3
Updated references to newer version of gnupg v2.1.0
28-Jun-2013
1.4
Corrected Key ID reference
03-Jul-2015
1.5
iLink administration documentation added
01-Sep-2015
1.6
Updated for new layout
Page 2
Copyright © 2015, Westpac Banking Corporation, ABN 33 007 457 141. All rights reserved.
Table of Contents
1
Introduction ..................................................................................................... 5
1.1
Security ............................................................................................................ 5
1.1.1
Initial Key Exchange ..................................................................................... 5
1.2
Pushing a file to Westpac .................................................................................... 5
1.3
Westpac pushing a file to the Customer ................................................................ 6
1.4
Polling a file from Westpac .................................................................................. 6
1.5
File & Directory Names ....................................................................................... 7
1.6
Network Connectivity ......................................................................................... 7
1.6.1
Transport Mechanism .................................................................................... 7
1.6.2
Addresses ................................................................................................... 7
1.6.2.1 Test ......................................................................................................... 7
1.6.2.2 Production ................................................................................................ 7
2
Quick Start ....................................................................................................... 8
3
iLink connectivity setup .................................................................................... 9
3.1
iLink URLs ......................................................................................................... 9
3.2
Setup connectivity form and documentation location .............................................. 9
3.2.1
Connectivity form for XCOM customers ............... Error! Bookmark not defined.
3.2.2
Getting the WIBS server’s details ....................... Error! Bookmark not defined.
4
Software Installation ...................................................................................... 11
4.1
Software Required ........................................................................................... 11
4.2
Gnupg Installation ........................................................................................... 11
4.2.1
Gnupg RSA public / private key generation .................................................... 19
4.2.1.1 Step 1 - Create the Key Pair ..................................................................... 19
4.2.1.2 Step 2 – Export you Public Key.................................................................. 21
4.2.1.3 Step 3 – Import Westpac’s Public Key ........................................................ 23
4.2.2
To Decrypt and incoming file using Gnupg ..................................................... 25
4.2.3
To Encrypt, Sign and ASCII Armour a file: ..................................................... 26
4.3
Installing and Configuring Unicenter CA-XCOM Data Transport (version R11) .......... 29
4.3.1
Artefacts ................................................................................................... 29
4.3.2
System requirements .................................................................................. 29
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4.3.3
Install Notes .............................................................................................. 29
4.3.4
Steps ........................................................................................................ 29
4.3.5
Verification ................................................................................................ 37
4.3.6
CA-XCOM R11 Application configuration ........................................................ 37
4.3.7
Security Permissions ................................................................................... 37
4.3.8
Testing the XCOM Connection ...................................................................... 37
4.3.8.1 To test the connection via the Internet or leased line ................................... 37
4.4
To Send a file via XCOM .................................................................................... 39
4.5
To Retrieve a file via XCOM ............................................................................... 39
4.6
XCom Receiving Command File .......................................................................... 39
4.7
Error Handling ................................................................................................. 41
5
FAQ ................................................................................................................. 42
5.1
Common XCom Error Messages ......................................................................... 42
5.2
What Platforms is XCOM available for? ................................................................ 43
5.3
XCOM User Account / Windows Domains ............................................................. 43
5.4
GPG2 Questions ............................................................................................... 44
6
Glossary ......................................................................................................... 46
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1
Introduction
This document defines Westpac’s WIBS XCOM file transfer protocol.
The XCOM file transfer protocol allows partners to transfer files securely and reliably over
the internet. PGP is used to provide encryption of data between partners, and digital
signing assures the identity of each partner.
The intended audience of this document is:

Server administrators who wish to use the provided command line scripts, and

Software developers who wish to implement this messaging protocol in their
software.
1.1
Security
All files transferred must be encrypted and digitally signed between P&P and the
customer site. This serves two purposes; the first is to ensure that the data cannot be
viewed by unauthorised sources. The second is to provide non-repudiation. Through the
use of public / private keys, data can be digitally ‘signed’, by ‘signing’ the file both
Westpac and the customer can be assured that the data originated from a known source
and it has not been tampered with.
1.1.1
Initial Key Exchange
To set up the XCOM transfer a customer will:


Provide Westpac with a PGP public key used to verify the digital signature of the data
file that is transferred between the customer and Westpac. Banking policy mandates
that any file written to a hard drive in an untrusted zone (a server connected to an
external network) must be PGP encrypted and digitally signed.
Provide a username and password for Westpac to log onto the customer’s XCOM
server if Westpac is required to push files back to the customer.
In return Westpac will:
Provide a username and password for the customer to log onto Westpac’s XCOM server.
Provide the customer with Westpac’s PGP public key. This would be used by the
customer to encrypt a file that is sent to Westpac (this customer signs the file with their
private key).
Agree with the customer on the file naming convention and their directory paths.
1.2
Pushing a file to Westpac
To push a file to Westpac the sending site carries out the following steps:
1. Encrypts the data using Westpac’s public key and signs the encrypted data with its
private key. To ensure that data does not get corrupted, when messages are
encrypted they must be ASCII armoured.
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2. The file is then given to XCOM client for transmission. XCOM connects to the remote
computer using the user/password that Westpac provided.
3. Once it is connected the file is transferred to the Westpac XCOM server into the
agreed directory.
4. Westpac detects the arrival of the file. The digital signature is checked against the
customers previously supplied PGP public key. If this matches then the file is
decrypted using Westpac’s private PGP key. Once the security aspects of the file have
been verified, it is then processed.
5. Once the file has been processed, it will be deleted from the incoming directory on
Westpac’s XCOM server.
6.
1.3
Westpac pushing a file to the Customer
For Westpac to push a file to the customer the following steps are carried out:
7. Westpac encrypts the data using customer’s public key and signs the encrypted data
with its private key. To ensure that data does not get corrupted, when messages are
encrypted they must be ASCII armoured.
8. The file is then given to XCOM client for transmission. Westpac’s XCOM server
connects to the remote computer using the user/password that the customer
provided.
9. Once it is connected the file is transferred to the customer’s XCOM server into the
agreed directory.
10. The customer detects the arrival of the file. The digital signature is checked against
Westpac’s previously supplied PGP public key. If this matches then the file is
decrypted using the customer’s private PGP key. Once the security aspects of the file
have been verified, it is then processed.
11.
1.4
Polling a file from Westpac
To poll a file from Westpac the polling site carries out the following steps:
12. Westpac encrypts the file using the customer’s public key ascii armours it and signs it
with Westpac’s private key and deposits it in a customer directory ready to be picked
up.
13. The customer’s XCOM client connects to the remote computer using the
user/password that Westpac provided.
14. Once the customer connects the customer preforms a ‘Retrieve’ to fetch the file
based on the agreed upon file naming specification.
15. Once the customer has fetched the file back to their site they should check the digital
signature is checked against Westpac’s previously supplied PGP public key. If this
matches then the file is decrypted using the customer’s private PGP key. Once the
security aspects of the file have been verified, it is then processed.
16. Westpac will keep the file on its XCOM server for 30 days to allow the customer
plenty of time to retrieve the file in the event of communications issue. After 30 days
Westpac will automatically delete the file. After this time the file can be regenerated
by contacting Westpac customer support.
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1.5
File & Directory Names
File names can be of any format as long as they do contain standard ASCII characters
that are valid for file names. It is not advised that filenames contain spaces, as this
makes XCom command line calls more difficult to build.
The destination directories of both Westpac and Customer sites must be communicated
to each other before a transfer can take place.
1.6
1.6.1
Network Connectivity
Transport Mechanism
XCOM will function on a variety of platforms and IP based networks. This includes the
Internet, Frame Relay and ISDN. Note before you will be able to access Westpac’s XCOM
server you must provide the IP address of your server running your XCOM client.
Westpac will then modify its firewall to allow your server access to Westpac’s XCOM
server on port 8044. The customer may also need to engage their own network support
staff to allow their XCOM client to connect on port 8044.
1.6.2
1.6.2.1
Addresses
Test
To transmit to Westpac via the Internet you must configure XCOM to send to
ssiw.support.qvalent.com (203.39.159.31) on port 8044.
To transmit to Westpac via a dedicated leased line (Frame relay, ISDN, dial or Ethernet)
you must configure XCOM to send to 10.168.252.4 or port 8044.
1.6.2.2
Production
To transmit to Westpac via the Internet you must configure XCOM to send to
ssiw.qvalent.com (192.170.86.151) on port 8044.
To transmit to Westpac via a dedicated leased line (Frame relay, ISDN, dial or Ethernet)
you must configure XCOM to send to 10.120.16.32 or port 8044.
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2
Quick Start
Customer task
Westpac task
1. Qvalent implementation consultant creates an iLink test account for the
customer’s technical contact.
2. Customer contact completes iLink connectivity form in test iLink.
3. Qvalent implementation consultant arranges configuration of the test
WIBS XCOM server.
4. Customer configures 3rd party software.
5. Customer codes XCOM scripts.
6. Customer undertakes testing in the test environment.
7. Once customer is satisfied that testing is complete a sign off email is
required to progress into production.
8. Qvalent implementation consultant creates an iLink production account for
the customer’s technical contact.
9. Customer contact completes iLink connectivity form in production iLink.
10. Qvalent implementation consultant arranges configuration of the
production WIBS XCOM server.
11. Customer tests the XCOM connection in the live environment.
12. Once this testing is successful customers can perform low value live
testing of the other Westpac products that are being implemented.
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3
iLink connectivity setup
In the early stages of your Westpac project you will be asked to provide the contact
details of the IT person who will be responsible for setting up your XOM connection.
Once these details are received you will be provided with an iLink login to enter your IP
addresses and public keys.
The iLink connectivity process has the following steps
1. The Qvalent implementation consultant will provide the user’s technical contact
with a login to the iLink test instance.
2. Fill in the setup connectivity form and submit
3. The WIBS connectivity team will receive a notification when the form is completed
and will configure the WIBS XCOM server with the new details. Please allow up to
3 working days for this configuration.
4. Once this configuration is complete a notification will be sent and the user will
need to configure the connection details provided on the updated connectivity
page.
5. User to send in a test file to test the XCOM connection and PGP encryption. Once
this is confirmed the use can also undertake any user acceptance testing relative
to their implementation.
6. Once the Qvalent implementation consultant has received confirmation that all
relevant testing has been completed steps 1 – 5 will need to be repeated in the
production environment.
3.1
iLink URLs
Test – https://ilink.support.qvalent.com
Production – https://ilink.westpac.com.au
3.2
Setup Connectivity form
To setup your connectivity, click the Connectivity menu option at the top of the screen,
then press the Setup Connectivity button. The Setup Connectivity will be displayed
where you can enter the following details:

PGP Key – Before files are sent via XCOM they are encrypted, the user’s PGP
public key is required to decrypt these files before processing them in the WIBS
messaging server.

Your XCOM Server Details – The fields in this section are the details that WIBS
uses when connecting to the user’s XCOM server to place files. The login provided
for this connection will need to have privileges to write to the directory provided.

IP Addresses – The WIBS solution has a white list of IP addresses accepted for
each user. Users need to provide the IP address or addresses that their incoming
requests will be coming from, this is the external IP address taking into account
any proxy servers or other externally facing network infrastructure. This can be
found by logging on to iLink on your XCOM server and taking the browser address
shown in the IP addresses section of the connectivity form.
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Once the WIBS server configuration is complete the user will receive an email notifying
them that they can begin testing. The user will then be able to see the WIBS server
details on the Setup connectivity page.

Westpac’s Keys
o
PGP Key – this is the public key that you will need to use to decrypt the
files you receive from WIBS.
o
Your Key - You can use these fields during testing to confirm which key
you have loaded into iLink

Westpac’s XCOM Server Details – This section contains the XCOM username
and password to enter to connect to the WIBS XCOM server and the directory for
placing customer  WIBS files.

Your XCOM Server Details – This section contains the XCOM username and
password for WIBS to connect to your server and the directory for placing WIBS
 customer files.
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4
4.1
Software Installation
Software Required
CA-XCOM
Unicenter Data Transport (version R11).
This is a commercial file transfer product
created by Computer Associates (CA).
Westpac will provide a copy to the
customer.
PGP
GNUPG (version 2.1.x). GnuPG
(www.gnupg.org). This is a public domain
PGP server that may be used free of
charge. Obtaining of this product is the
responsibility of the customer; however
Westpac is able to provide technical
assistance to support this.
4.2
Gnupg Installation
1. Start the installation by clicking on the gnupg exe (gnupg-w32cli-1.4.x.exe). The
following screen will be displayed.
2. Click on the ‘Next’ button
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3. Click on the ‘Next’ button
4. Accept the default selection and click on ‘Next’
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5. Either accept the default installation directory or enter in your preferred path.
6. Accept the default start menu folder name and click on ‘Install’.
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7. The installation complete dialog will be displayed.
8. Click on ‘Finish’ to complete the installation. Read all documentation associated with
Gnupg.
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4.2.1
Gnupg RSA public / private key generation
Once Gnupg has been installed you need to generate a public key to give to partners you
will exchange files with and a private key. These two keys will be kept in your private
and public key rings. Your private key ring will only contain only your private key, while
your public key ring will contain your own public key and the public keys of any other
business partners (such as Westpac) who will provide you with their public key.
4.2.1.1
Step 1 - Create the Key Pair
The first step is to create the key rings and your own public / private key pair.
Log onto the server that you installed gnupg and change to the gnupg installation
(d:\program files\gnu\gnupg) directory. Enter the following command:
C:\Program Files\GNU\GnuPG\gpg2 --gen-key
gpg2 (GnuPG) 2.1.0; Copyright (C) 2009 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Please select what kind of key you want:
(1) RSA and RSA (default)
(2) DSA and Elgamal
(3) DSA (sign only)
(4) RSA (sign only)
Your selection? 1
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048)
Requested keysize is 2048 bits
Please specify how long the key should be valid.
0 = key does not expire
<n>
= key expires in n days
<n>w = key expires in n weeks
<n>m = key expires in n months
<n>y = key expires in n years
Key is valid for? (0)
Key does not expire at all
Is this correct? (y/N) y
You need a user ID to identify your key; the software constructs the user ID
from the Real Name, Comment and Email Address in this form:
"Heinrich Heine (Der Dichter) <[email protected]>"
Real name: Stephen Macmillan
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Email address: [email protected]
Comment: Acme
You selected this USER-ID:
"Stephen Macmillan (Acme) <[email protected]>"
Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
You need a Passphrase to protect your secret key.
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
+++++
+++++
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
....+++++
+++++
gpg2: key 682B25F2 marked as ultimately trusted
public and secret key created and signed.
gpg2: checking the trustdb
gpg2: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg2: depth: 0
pub
valid:
1
signed:
0
trust: 0-, 0q, 0n, 0m, 0f, 1u
2048R/A28F9F1C 2010-01-22
Key fingerprint = 3230 E29F BA96 23D3 DA57 1D9E 204A B8F7 A28F 9F1C
uid
sub
Stephen Macmillan (Acme) <[email protected]>
2048R/E5CA1204 2010-01-22
C:\Program Files\GNU\GnuPG>
Note that the pubring and secring are stored in the following locations. GPG2 knows
these locations via the registry.
gpg2: keyring `C:/Documents and Settings/StephenM/Application Data/gnupg\secring.
gpg2' created
gpg2: keyring `C:/Documents and Settings/StephenM/Application Data/gnupg\pubring.
gpg2' created
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To specify a different location of the key rings use the --homedir parameter. Please
make sure these files will not be removed/deleted.
4.2.1.2
Step 2 – Export you Public Key
Once the public and private keys are generated you need to export your public
key and provide it to Westpac (or any other business partner you will be
exchanging PGP encrypted data with)
1
From the command prompt, navigate to the GnuPG folder (if not already in this
directory from the last section)
2
From the command line, issue the following command:
> gpg2 --output <filename_to_write_exported_key_to> -a --export
<id_of_key_to_export> [Enter]
3
To check to see if a PGP public key was generated, you are able to perform from the
command line the following command:
> type <filename_specified_in_step_2> [Enter]
Output Check
The output from Steps 1 and 3 should be similar to:
D:\Program Files\GNU\GnuPG>gpg2 --output acme_pgp_pub_key.txt -a --export smac
[email protected]
D:\Program Files\GNU\GnuPG>type acme_pgp_pub_key.txt
-----BEGIN PGP PUBLIC KEY BLOCK----Version: GnuPG v2.1.0 (MingW32)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YWNtaWxsYW4gKFF2YWxlbnQpIDxzbWFjbWlsbGFuQHF2YWxlbnQuY29tPohgBBMR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=6k85
-----END PGP PUBLIC KEY BLOCK-----
D:\Program Files\GNU\GnuPG>
Email this file to Qvalent (or any other business partner). When they import your public
key they should contact you to verify the fingerprint (to be assured that it came from
you).
To check the fingerprint of your public key issue the command
> gpg2 –-fingerprint [email protected]
The output should be similar to:
Output Check
The output from the fingerprint check command should be similar to the following:
C:\Program Files\GNU\GnuPG>gpg2 --fingerprint [email protected]
pub
2048R/A28F9F1C 2010-01-22
Key fingerprint = 3230 E29F BA96 23D3 DA57
uid
sub
1D9E 204A B8F7 A28F 9F1C
2048R/E5CA1204 2010-01-22
From the above the fingerprint for this key is:3230 E29F BA96 23D3 DA57
1D9E 204A B8F7
A28F 9F1C
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4.2.1.3
Step 3 – Import Westpac’s Public Key
Westpac will provide you with their public key to import into your public key
ring. This is a two-step process. You firstly import the key then you digitally
sign it to say you trust the key.
1
To import the Qvalent public key into the keyring, type the command...
gpg2 --import <filename_of_file_containing_qvalent_public_key> [Enter]
2
Verify the key was added to the keystore correctly by listing the public keys in the
public keyring
gpg2 --list-keys [Enter]
Output Check
The output from the above two steps should be similar to:
D:\Program Files\GNU\GnuPG>gpg2 --import 17155x01_qvalent_pub_key.asc
gpg2: key C2E36CC8: public key "17155x01" imported
gpg2: Total number processed: 1
gpg2:
imported: 1
C:\Program Files\GNU\GnuPG>gpg2 --list-keys
C:/Documents and Settings/user/Application Data/gnupg\pubring.gpg2
------------------------------------------------------------------pub
uid
2048R/A28F9F1C 2010-01-22
sub
2048R/E5CA1204 2010-01-22
pub
1024D/C2E36CC8 2001-10-15
uid
sub
17155x01
2048g/2E52ED13 2001-10-15
Note:
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In the Production environment, the Qvalent Production Public Key is 17155x01
3
The Qvalent public key needs to be validated (assume the imported key id was
‘imported_key’)
gpg2 --edit-key imported_key [Enter]
You should receive some text on screen and then a prompt which looks like this
Command>
4
At the Command> prompt within gpg2, please type the following in bold
Command> sign [Enter]
5
You should verify at this step that the Qvalent key is valid and that they key you are
signing with is the key generated in the previous step
If you are confident of this. Enter ‘Y’ to sign the key
6
Enter the passphrase of the keys generated in Part 1
Gpg2 will then take you back to the Command> prompt once completed
7
At the Command> prompt press ‘q’ to quit
8
When asked to confirm the changes, press ‘Y’
Output Check
The output from Steps 3 to 8 should be similar to the below output:
C:\Program Files\GNU\GnuPG>gpg2 --edit-key [email protected]
gpg2 (GnuPG) 2.1.0; Copyright (C) 2009 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
pub
sub
1024D/AD8A9D42
1024g/26787C6E
created: 2001-11-01
expires: never
trust: unknown
validity: unknown
created: 2001-11-01
expires: never
usage: SCA
usage: E
[ unknown] (1). test <[email protected]>
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Command> sign
pub
1024D/AD8A9D42
created: 2001-11-01
expires: never
trust: unknown
validity: unknown
Primary key fingerprint: D732 F115 31BE 2DE1 40C9
usage: SCA
185F 07F8 8DFE AD8A 9D42
test <[email protected]>
Are you sure that you want to sign this key with your
key "Stephen Macmillan (Acme) <[email protected]>" (A28F9F1C)
Really sign? (y/N) y
You need a passphrase to unlock the secret key for
user: "Stephen Macmillan (Acme) <[email protected]>"
2048-bit RSA key, ID A28F9F1C, created 2010-01-22
Command> q
Save changes? (y/N) y
4.2.2
To Decrypt and incoming file using Gnupg
d. To decrypt an incoming file:
> gpg2 --output <filename_to_write_plaintext> --decrypt
<filename_of_encrypted_data>
- Enter password for private key
( OR if using a batch-type environment ) >gpg2 --yes --output
[filename_to_write_plaintext] --batch --passphrase-fd 0 --homedir [path_of_keyrings] -decrypt [filename_of_encrypted_data] <[filename_of_file_containing_password]
An example of a batch file to do this would consist of:
gpg2 --y --output test_dec.txt --batch --passphrase-fd 0 --decrypt example.txt.asc
<password.txt
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note: that password.txt contains you PGP private key password and is piped into the
gpg2 command.
The output when this batch file is executed would be:
D:\Program Files\GNU\GnuPG>dec
D:\Program Files\GNU\GnuPG>gpg2 --y --output test_dec.txt --batch -passphrase-fd 0 --decrypt test.asc <password.txt
gpg2: encrypted with 2048-bit ELG-E key, ID 2E52ED13, created 2001-10-15
"17155x01"
gpg2: encrypted with 2048-bit ELG-E key, ID C45CC395, created 2005-10-07
"Stephen Macmillan (Acme) <[email protected]>"
gpg2: Signature made 10/07/05 15:49:30 using DSA key ID C2E36CC8
gpg2: Good signature from "17155x01"
4.2.3
To Encrypt, Sign and ASCII Armour a file:
To encrypt (and sign) data to send to Westpac (assume recipient key id is
'imported_Westpac_key', and your local key-pair id is 'local_key'):
> gpg2 --compress-algo 1 --cipher-algo cast5 --armor --recipient
imported_Westpac_key --local-user local_key --output
<filename_to_write_encrypted_data> -se <filename_containing_data_to_encrypt>
- Enter password for private key
( OR if using a batch-type environment ) > gpg2 --compress-algo 1 --cipher-algo cast5 -passphrase-fd 0 --armor --recipient imported_Westpac_key --local-user local_key -output [filename_to_write_encrypted_data] -se [filename_containing_data_to_encrypt]
<[filename_of_file_containing_password]
An example of a batch file to do this would consist of:
gpg2 --compress-algo 1 --cipher-algo cast5 --passphrase-fd 0 --armor --recipient
17155x01 --local-user [email protected] --output test_enc.asc -se test.txt
<password.txt
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note: that password.txt contains you PGP private key password and is piped into the
gpg2 command.
The output when this batch file is executed would be:
D:\Program Files\GNU\GnuPG>enc.bat
D:\Program Files\GNU\GnuPG>gpg2 --compress-algo 1 --cipher-algo cast5 --passphras
e-fd 0 --armor --recipient 17155x01 --local-user [email protected] --output
test_enc.asc -se test.txt <password.txt
Reading passphrase from file descriptor 0
You need a passphrase to unlock the secret key for
user: "Stephen Macmillan (Acme) <[email protected]>"
1024-bit DSA key, ID 06F7317E, created 2005-10-07
gpg2: checking the trustdb
gpg2: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg2: depth: 0
valid:
1
signed:
1
trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg2: depth: 1
valid:
1
signed:
0
trust: 1-, 0q, 0n, 0m, 0f, 0u
D:\Program Files\GNU\GnuPG>type test_enc.asc
-----BEGIN PGP MESSAGE----Version: GnuPG v1.4.2 (MingW32)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d9MF/0it3GwrDF5zHPC7tX7mJ8Nv2w==
=mbYr
-----END PGP MESSAGE-----
Page 28
4.3
4.3.1
Installing and Configuring Unicenter CA-XCOM
Data Transport (version R11)
Artefacts
1. Advantage CA-XCOM Unicenter Data Transport (version R11) installation CD
4.3.2
System requirements
Required OS for windows install:
 Windows 2003 Server.
Note: XCOM R11 will not install on a domain controller.
4.3.3
Install Notes
Ensure you have the correct version of XCOM. If you are installing XCOM on a server you
need the server addition of XCOM. If you are installing it on a desktop you need the
professional addition.
XCOM must be installed via the console or terminal services using the console switch i.e.
mstsc / console <server.rdp>. XCOM will note install via a standard terminal server
window.
4.3.4
Steps
1. Insert the Advantage CA-XCOM installation CD into the machine’s CD-ROM drive. If
the installation process does not start automatically, start it by running the
‘setup.exe’ executable in the root directory of the CD.
2. Click ‘Next’
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Page 30
3. Click ‘Yes’
4. Click ‘Next’.
Page 31
5. Ensure the ‘Anyone who uses this computer (all users)’ radio button is selected, and
click ‘Next’.
Page 32
6. Set the XCom installation directory by clicking the ‘Browse’ button. The
recommended installation directory for Unicenter CA-XCOM is ‘D:\xcomnt’. If a
different installation directory is chosen then record it for later use. Once the
installation directory has been set, click ‘Next’
7. Select ‘Custom’ and click ‘Next’.
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8. Un-check the ‘CA-XCOM SNA’ checkbox and click ‘Next’.
Page 34
9. Click ‘Next’.
10. When the installation is complete, select the ‘No, I will restart my computer later’
radio button and click ‘Finish’.
Page 35
11. Using the Windows Services configuration window, change the ‘XCOMD Unicenter CAXCOM Scheduler Service’ service to ‘Automatic’ start-up type.
12. Restart the machine.
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4.3.5
Verification
1. Check that the ‘XCOMD Unicenter CA-XCOM Scheduler Service’ exists in the list of
system services, and is ‘Started’.
4.3.6
CA-XCOM R11 Application configuration
1. From the root directory of the CA-XCOM application installation, open the file
’\config\xcom.glb’ in Notepad, (or your preferred text editor)
2. Set the value for the property ‘EXPIRATION_TIME=’ to ‘600’ instead of the default
‘6000’
3. A batch file can be set up to run upon XCom successfully receiving a file. Set the
value for the property ‘XPPCMD=’ to the name of the batch file to be run (full path
required).
4. Set the value for the property ‘XCOM_USERID=’ to the empty string (ie. Nothing).
5. Save and close the file.
6. Restart the “XCOMD Unicenter CA-XCOM Scheduler Service” Windows service.
7. To obtain external access to the XCOM Client, a Windows User will need to be added
to the Windows Operating System, as per details required by the external system,
which the XCOM Client will be used to communicate with. This will be the XCom
username/password logon details used by external systems to communicate with
your XCom client.
4.3.7
Security Permissions
In order for Westpac to send a file to your XCOM server you must provide Westpac with
an account and password. This is a system level account i.e. Windows or Unix account.
The account must have enough privileges to do the following:
1. Write to the directory where you installed XCOM. This is required to place the
incoming data on the XCOM queue.
2. Write to the directory where you require the incoming file to be placed. This is the
directory where Westpac will tell XCOM to write the file.
4.3.8
Testing the XCOM Connection
The next step is to test the connectivity between your XCOM client and Westpac. Before
doing this please confirm the following:
17. You have provided your server’s IP address and Westpac has confirmed that it has
allowed that address through its firewall on port 8044.
18. You have allowed your server to communicate on port 8044 through your own
firewalls.
19. You have provided your PGP public key to Westpac.
20. Westpac has provided you with their PGP public key.
21. Westpac has provided you with an XCOM username and password.
4.3.8.1
To test the connection via the Internet or leased line
To first check that you have connectivity try the following from your XCOM client:
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1. Open a command prompt (cmd.exe)
2. Depending on your network path try the following telnet command:
a. Via Internet try: telnet ssiw.qvalent.com 8044
b. Via Leased line try: telnet 10.120.16.32 8044
If you get a connection the screen should look like:
_
(blank screen with flashing cursor in top left hand corner)
If the screen looks like:
H:\>telnet ssiw.qvalent.com 8044
Connecting To ssiw.qvalent.com...Could not open connection to the host, on port
8044: Connect failed
Then you can not establish a connection so consult with your network personnel. This
could mean one of a couple of things. If you are connecting to the TEST environment
(ssiw.support.qvalent.com) then it could mean that you have not opened your firewall
for outbound connections. Westpac has no firewall restrictions on connections from the
internet to its test environment.
If you are connecting to production, then you must provide Westpac with your
production IP address as you must open your own firewall and Westpac need to open
there’s as well. The IP address must be provided 5 days in advance before the go live
date.
To send a test transmission use a command similar to:
d:\xcomnt\xcomtcp.exe -c1 -f REMOTE_SYSTEM=<Westpac_ip_address> PORT=8044
USERID=<user> PASSWORD=<password>
REMOTE_FILE=<directory\file_to_write_into> PROTOCOL=TCPIP FILE_OPTION=CREATE
TRANSFERIDENTIFIER=FILE QUEUE=NO COMPRESS=NO LOCAL_FILE=<file_to_send>
Note: If your XCOM server is in a windows domain then please refer to FAQ
section 5.3
Page 38
An example XCOM transfer is similar to:
D:\pgp_scripts>d:\xcomnt\xcomtcp.exe -c1 -f REMOTE_SYSTEM=ssiw.qvalent.com
PORT=8044 USERID=testuser PASSWORD=xxxxxx REMOTE_FILE=test\test_file.txt.asc
PROTOCOL=TCPIP FILE_OPTION=CREATE TRANSFERIDENTIFIER=FILE QUEUE=NO COMPRESS=NO
LOCAL_FILE=test_file.txt.asc
(c) 2002 Computer Associates International, Inc. (CA).
05/10/14 11:49:14 TID=000003 [test_file.txt.asc --> test\test_file.txt.asc at qv
ts3]
XCOMN0029I Locally initiated transfer started.
05/10/14 11:49:18 TID=000003
XCOMN0011I Transfer ended; 19 records (1030 bytes) transmitted in 4 seconds
(257 bytes/second)
D:\pgp_scripts>
4.4
To Send a file via XCOM
d:\xcomnt\xcomtcp.exe -c1 -f REMOTE_SYSTEM=<remote_system_ip_address>
PORT=8044 USERID=<Westpac_assigned_username>
PASSWORD=<Westpac_assigned_password> REMOTE_FILE=remoteDir\remoteFilename.txt
PROTOCOL=TCPIP FILE_OPTION=CREATE TRANSFERIDENTIFIER=FILE QUEUE=NO
COMPRESS=NO LOCAL_FILE=localFilename.txt
4.5
To Retrieve a file via XCOM
d:\xcomnt\xcomtcp.exe -c4 -f REMOTE_SYSTEM_RF=<Westpac_ip_address> PORT=8044
USERID=<Westpac_assigned_username> PASSWORD=<Westpac_assigned_password>
REMOTE_FILE_RF=<file_to_retrieve> PROTOCOL=TCPIP TRANSFERIDENTIFIER=RETRIEVE
QUEUE=NO FILE_OPTION_RF=CREATE LOCAL_FILE_RF=<file_to_write_retrieved_data_to>
the <file_to_retrieve> will be \\nas\Production\XcomRetrieve\<CustomerDir>\<filename>
i.e. \\nas\Production\XcomRetrieve\Acme\Recall20080815.txt.asc
4.6
XCom Receiving Command File
An example command file that gets executed by the XCOM client when it receives a file:
Page 39
echo This batch file should only be opened using an XCom program, as the parameters
that are required are very specific!
rem --------------------------------------------------------------------------rem Application and Resource locations
rem --------------------------------------------------------------------------SET JAVA_HOME=e:\jdk1.3
SET JARS_FOLDER=e:\FileTransfer\jars
rem --------------------------------------------------------------------------rem Property file location (fully qualified)
rem --------------------------------------------------------------------------SET PROPERTIES_FILENAME=e:\FileTransfer\cte_filetransfer_adapter.properties
rem --------------------------------------------------------------------------rem Class files
rem --------------------------------------------------------------------------SET
DEPENDENT_JARS=%JARS_FOLDER%\xerces.jar;%JARS_FOLDER%\xalan.jar;%JARS_F
OLDER%\ctcore.jar;%JARS_FOLDER%\jcert.jar;%JARS_FOLDER%\jnet.jar;%JARS_FOL
DER%\jsse.jar;%JARS_FOLDER%\xp.jar;%JARS_FOLDER%\ConnectorCore.jar
rem --------------------------------------------------------------------------rem Get the parameters we need
rem --------------------------------------------------------------------------rem Get the Transaction ID (13th parameter)
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
SHIFT /1
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SHIFT /1
SHIFT /1
SHIFT /1
rem Get the Received filename (20th parameter)
SHIFT /2
SHIFT /2
SHIFT /2
SHIFT /2
SHIFT /2
SHIFT /2
%JAVA_HOME%\bin\java -mx800m -ms16m -classpath %DEPENDENT_JARS%
com.Westpac.exchange.connector.xcom.ReceiveNewFile %PROPERTIES_FILENAME% %1
%2
4.7
Error Handling
From a batch file you should always check the error level after the xcom call to ensure
that the transfer was successful. Sample pseudo code for the batch file would be:
d:\xcomnt\xcomtcp.exe -c1 -f REMOTE_SYSTEM=ssiw.qvalent.com PORT=8044
USERID=testuser PASSWORD=xxxxxx REMOTE_FILE=test\test_file.txt.asc PROTOCOL=TCPIP
FILE_OPTION=CREATE TRANSFERIDENTIFIER=FILE QUEUE=NO COMPRESS=NO
LOCAL_FILE=test_file.txt.asc >> output.txt
if %ERRORLEVEL% NEQ 0 GTOTO ERROR
echo Successful Transmission
exit
ERROR:
Echo Bad Transmission
email output.txt to support personnel
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5
FAQ
5.1
Common XCom Error Messages
a.
If the XCom error message looks like:
(Standard Output Stream...)
(Error Stream...)
Copyright (c) 1992, 1996 Computer Associates International, Inc.
All rights reserved.
03/04/14 10:52:51 TID=020485 [<filename> --> <filename> at <ip_address>]
XCOMN0029I Locally initiated transfer started.
03/04/14 10:52:52 TID=020485
#XCOMN0298E Unable to allocate remote transaction program: Txpi
Socket connect error return value = 10061
211:
This means that your XCom client could not obtain a connection to the external XCom
client. This will be due to either a network issue, or the external system’s XCom client
service not running.
b.
If the XCom error message looks like:
2008/02/11 18:18:12 TID=004413 PRG=xcomtcp PID=4904 IP=192.168.80.111
XCOMN0805I TCP/IP Connection Ended.
2008/02/11 18:18:12 TID=004413
XCOMN0288E System function failed
This means that when Westpac sends you a file the batch job you has specified in the
<xcom install directory>\Config\xcom.glb i.e.
XPPCMD=e:\FileTransfer\ReceivedNewXComFile.bat
Is failing to execute correctly and terminating abnormally. To debug the issue edit the
xcom.glb file and change:
1. SHELL_CMD="cmd.exe" "/c" To SHELL_CMD="cmd.exe" "/k"
2. Restart the XCOM service
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This will cause the DOS box to stay on the screen when the batch file runs when a file is
received. Log into the server using the console and you will be able to see what is
causing the error in your batch file. When it is fixed ensure that you set SHELL_CMD
back to the “/c” switch to prevent the dialog boxes staying on the console.
c) XCOM will not install via terminal services
Please see section 4.3.3 Install Notes
5.2
What Platforms is XCOM available for?
Please consult the following link:
http://supportconnectw.ca.com/public/xcom/infodocs/ca-xcom_verschart.asp
5.3
XCOM User Account / Windows Domains
When you create an XCOM user account under Windows NT it must be a local user on
the server XCOM is installed and not a domain user account. A few other tips when
creating an XCOM user account are:
It is also advisable that you create an ‘XCOM User Group’ and place this user into this
group. For NT2000 and NT2003, ensure that the ‘XCOM User Group’ has sufficient
privileges to read & write files and execute scripts on the disk(s) where XCOM is installed
or files will be accessed (such as the batch file that is called when a file is received).
Try logging into the server using the just created XCOM user to ensure that there was no
typo’s with the username or password.
If you are using NT2003, ensure that the ‘XCOM User Group’ has the security rights to
‘Access this computer from the network’.
If your xcom server is in a windows domain you must use the command line parameter
DOMAIN= (blank space following equals sign) when sending to Westpac i.e.
d:\xcomnt\xcomtcp.exe -c1 -f DOMAIN= REMOTE_SYSTEM=<remote_ip_address>
PORT=8044 USERID=<Westpac_assigned_username>
PASSWORD=<Westpac_assigned_password> REMOTE_FILE=remoteDir\remoteFilename.txt
PROTOCOL=TCPIP FILE_OPTION=CREATE TRANSFERIDENTIFIER=FILE QUEUE=NO
COMPRESS=NO LOCAL_FILE=localFilename.txt
If you do not use this you will receive an “error setting the remote user id” from Westpac
as your xcom server will be passing its domain name with its user name and Westpac
will reject it.
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5.4
GPG2 Questions
Q) When I decrypt a file with GPG2 I get the following WARNING:
gpg2: encrypted with 2048-bit ELG-E key, ID 2E52ED13, created 2001-10-15
"17155x01"
gpg2: encrypted with 1024-bit ELG-E key, ID C45CC395, created 2005-10-07
"Stephen Macmillan (Westpac) <[email protected]>"
gpg2: Signature made 10/07/05 15:49:30 using DSA key ID C2E36CC8
gpg2: Good signature from "17155x01"
gpg2: WARNING: message was not integrity protected
A) This is a compatibility issue between GPG2 and eBusiness server and can be ignored.
The important line to note is “Good signature from 17155x01” This tells you that the
file has not been tampered with.
Q) When I encrypt a file using GPG2 I receive the following WARNING even though I
have imported Westpac’s key and signed it:
It is NOT certain that the key belongs to the person named in the user ID. If you
*really* know what you are doing, you may answer the next question with yes.
Use this key anyway? (y/N)
A) Try setting the trust level on the key using the command:
Gpg2 –edit-key <key name>
Set the trust level to ‘ultimate’.
Q) When I encrypt a file using a batch program with GPG2 and the file already exists the
batch job stops and prompts me to about replacing the file:
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File ‘XXX.asc’ exists. Overwrite? (y/N)
B) Try using the parameter ‘--yes’ on your GPG2 encrypt / decrypt command line. This
will automatically answer ‘Yes’ for most questions GPG2 prompts for i.e.
gpg2 --yes --output [filename_to_write_plaintext] --batch --passphrase-fd 0 --homedir
[path_of_keyrings] --decrypt [filename_of_encrypted_data]
<[filename_of_file_containing_password]
Q) I’m having trouble connecting to Westpac’s test or production environments, what
should I try?
A) Refer to section 4.3.8 Testing the XCOM Connection.
Q) Can a file be encrypted with more than one public key?
A) Yes! Westpac always encrypts files that it is sending to customers with both the
customers public key and Westpac’s public key. This allows a customer that is having
difficulty decrypting a file (it may have become corrupted in transit) to send it back to
Westpac to test decrypting it.
Q) How can a file be encrypted with more that one public key? Doesn’t this make the file
twice as big?
A) No. When GPG2 encrypts a file it generates a random session key and uses this
random key to do the actual encryption. It then encrypts this session key with the
recipient’s public key and appends this data to the encrypted file. As Westpac always
encrypts an outbound file with its own public key, the session key is also encrypted with
Westpac’s public key and this data is also added to the encrypted file. So encrypting with
additional public keys only makes the file slightly larger. By doing this either the
recipient or Westpac can use their private key to decrypt the session key which inturn is
used to decrypt the file.
Q) When I receive an encrypted file how do I know what public key(s) it has been
encrypted with?
A) use the following gpg2 command:
# gpg2 --list-only --decrypt <file name>
gpg2: encrypted with 1024-bit ELG-E key, ID 26787C6E, created 2001-11-01
"test <[email protected]>"
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6
Glossary
CA-XCOM
CA-XCOM is a cross-platform, valueadded data transport solution, providing
high-performance unattended file
transfer with complete audit trails and
reporting. CA-XCOM provides a single
solution for sending and receiving files,
as well as sending reports and jobs, to a
wide range of platforms. This is
Westpac’s standard file transfer
mechanism.
Certificate
An electronic document that identifies an
entity (e.g. a person, computer or
company). Each certificate contains the
entity’s public key, along with details
about which encryption algorithms the
entity can use. Certificates are issued by
Certificate Authorities (CAs) when the
CA verifies the entity requesting the
certificate.
Each certificate contains a subject,
describing who the certificate is for, and
an issuer, describing the organisation
that signed the certificate.
The certificate contains the entity’s
public key, as well as the digital
signature of the CA. This signature is like
a hologram on a credit card, verifying
that the CA has authenticated the
entity’s identity.
Certificates can be marked for various
purposes, including SSL client, SSL
server and CA. See also Certificate
Authority, Digital Signature, SSL and
Public Key Encryption.
Certificate Authority
A trusted third party that signs
certificates for other parties. Often in
internet communications, the two parties
will not trust each other, but will trust a
third party. Party A can trust party B’s
certificate if it is signed by that third
party (the certificate authority or CA).
Certain CAs (e.g. Verisign, Thawte) are
automatically trusted by all certificate
software. See also Certificate and
Certificate Hierarchy.
Certificate Hierarchy
The chain of certificates for an entity
consisting of that entity’s certificate and
any CAs which signed the certificate. All
certificates are signed by another
certificate, generating a hierarchy. This
hierarchy terminates at a root
certificate, which is self-signed. This
type of certificate contains an identical
issuer and subject.
A certificate is trusted by a party if the
certificate chain terminates at a CA
which is trusted by that party. Each
party maintains a list of trusted root
CAs. See also Certificate, Certificate
Authority and Self-signing.
Diffie-Hellman
Diffie-Hellman (DH) was the first openly
published public key system [DH76]
(more correctly Diffie-Hellman is a keyexchange mechanism) and as such has
received extensive analysis by eminent
cryptographers. Westpac uses a 2048 bit
key size.
Digital Signature
A process of signing a message
electronically. Normally, the sender of a
message will calculate a message digest,
then encrypt that digest value with the
sender’s private key. This resulting value
is the digital signature.
The receiver can verify the signature by
calculating the message digest, and
comparing it to the value obtained by
decrypting the digital signature with the
sender’s public key. See also Message
Digest and Public Key Encryption.
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DSA / DSS
Digital Signature Algorithm (DSA) /
Digital Signature Standard (DSS). DSA
produces a fixed width signature
(irrespective of the public/private key
size for the authentication of electronic
documents. Westpac uses a 1024 bit key
size.
ElGamal
In cryptography, the ElGamal encryption
system is an asymmetric key encryption
algorithm for public-key cryptography
which is based on the Diffie-Hellman key
agreement. ElGamal encryption is used
in the free GNU Privacy Guard software,
recent versions of PGP, and other
cryptosystems. The Digital Signature
Algorithm (DSA) is a variant of the
ElGamal signature scheme, which should
not
be
confused
with
ElGamal
encryption.
Encryption/Decryption
The process of scrambling a message so
that it cannot be read by a third party
while in transit. The sender encrypts a
message before sending, and the
receiver decrypts the received message
before reading it.
Many algorithms are available to encrypt
data. Examples include RSA, RC4 and
DES. The algorithm is generally wellknown, but a number (called a key)
must be used with the algorithm to
produce an encrypted result or to
decrypt previously encrypted
information. Decryption with the correct
key is simple, whereas without the key,
decryption is almost impossible.
HTTP
Hypertext Transfer Protocol: The
application level protocol that is used to
transfer data on the web. A client sends
a request message to the server, and
the server sends a response message.
Each message consists of a start line
(which is either a request line or a status
line as appropriate), followed by a set of
message headers and finally an optional
message body.
The request line contains the method
(usually GET or POST) used for the
request. GET is a simple request for
information, whereas POST allows the
client to send data to the server in the
request.
A web browser generally sends a GET
request to the server for information,
and the server responds with a HTML
document in the response for the
browser to display.
The HTTP protocol uses the TCP/IP
protocol to transport the information
between client and server. HTTP uses
TCP port 80 by default. See also TCP/IP.
HTTPS
Hypertext Transfer Protocol, Secure: The
HTTP protocol using the Secure Sockets
Layer (SSL), providing encryption and
non-repudiation. HTTPS uses TCP port
443 by default. See also HTTP and SSL.
Message Digest
A mathematical function which
generates a number from a message
(also called a one-way hash). The
generated number is unique for the
message, in that changing any part of
the message changes the resulting
number. The function is one-way in that
it is, for all practical purposes,
impossible to determine the message
from the number. Common algorithms
are MD5 and SHA-1.
Non-repudiation
Assurance the sender of data is provided
with proof of delivery and the recipient is
provided with proof of the sender's
identity, so neither can later deny having
processed the data.
Proxy Server
An intermediate server on the client side
of a HTTP transaction which makes
requests on behalf of the client. Proxy
servers improve corporate security by
only exposing the proxy server to the
Page 47
internet, rather than each individual
computer in the organisation.
The client sends its request to the proxy
server, which then sends the request
(with any modifications) to the server.
The server responds to the proxy, which
then passes the response to the client.
Proxy Server
request
request
Client
Server
response
response
System administrators can restrict which
servers are accessible simply by
configuring the proxy server. See also
HTTP.
Public Key Encryption
An encryption method where different
keys are used for encryption and
decryption. Each party has two keys – a
public key and a private key. Messages
encrypted with the public key can only
be decrypted with the private key, and
messages encrypted with the private key
can only be decrypted by with the public
key. Each party publishes their public
key and keeps their private key secret.
Encryption is accomplished by the
sender encrypting the message with the
receiver’s public key. The message can
then only be decrypted by the receiver
with his private key.
Non-repudiation is accomplished by the
sender encrypting the message with her
private key. The message can then be
decrypted by anyone with the sender’s
public key (which is published), but the
receiver can be assured of the
message’s origin. See also Symmetric
Key Encryption and Encryption.
Self-Signing
Self-signing occurs when the owner of a
key uses his private key to sign his
public key. Self-signing a key establishes
some authenticity for the key, at least
for the user IDs. The user ID of the
signature must match the user ID of the
key. (Where there are multiple user IDs,
the ID of the signature must match the
primary ID of the key.) Also, the key ID
of the signature matches the key ID of
the key. This verifies that whoever
placed a user ID on a public key also
possesses the private key and
passphrase. Of course, this does not
verify that the owner of the key is really
who she says she is. That is done by the
signatures of others on the public key
(such as a root CA like Verisign).
SOAP
Simple Object Access Protocol: An XMLbased protocol allowing remote
procedure calls and asynchronous
messaging. SOAP generally uses HTTP to
transport the messages between
computers. SOAP is becoming popular
because of its use of standard internet
protocols as its basis. See XML and
HTTP.
SSH
Secure Shell: SSH is a secure delivery
mechanism. It is the encrypted protocol
that allows secure communications
between two parties. The file transfer
protocol that lies under SSH can be
either XCOM or SCP. SCP is a single-file
copy protocol where a single file can be
non-interactively transferred between
two hosts. Compare this to the standard
“copy” command across two network
shares XCOM is an interactive protocol
that allows browsing of the remote host
as well as file transfers. Compare this to
the standard interactive “ftp” protocol.
SSL
Secure Sockets Layer: A protocol
designed by Netscape to encrypt data,
authenticate the client and server and
ensure message integrity. SSL sits
between the application layer protocol
Page 48
(e.g. HTTP) and above the TCP/IP
network protocol.
The SSL handshake establishes the SSL
connection, setting up the secure
channel. In this process, the server
presents its certificate to the client for
authentication:
 The server encrypts some data with
its private key and the client then
checks this signature with the public
key from the server’s certificate.
 The client checks that the server
DNS name is the same as that in the
certificate.
 The client checks that the server
certificate has not expired.
 The client checks that the server’s
certificate is signed by a trusted CA.
The server can also optionally require
the client to present its certificate to the
server for authentication.
The handshake also allows the client and
server to agree on an encryption
algorithm (a symmetric key algorithm
for speed), and securely exchange the
session key. This session key is used in
the encryption algorithm which encrypts
the data exchanged between the client
and server after the handshake is
finished. The session key length can be
40-bit, 56-bit or 128-bit, with the longer
keys being more difficult to break. See
also TCP/IP.
Symmetric Key Encryption
An encryption method where the sender
and receiver use the same key to
encrypt and decrypt the message. This
method relies on the key being kept
secret between the two parties. If the
key is discovered, anyone can read the
messages in transit, or send false
messages to the receiver.
This type of encryption is often used for
bulk encryption because it is much faster
than public key encryption. See also
Encryption and Public Key Encryption.
TCP/IP
Transmission Control Protocol over
Internet Protocol. IP allows packets of
data to be sent across the internet from
one computer to another. TCP provides a
reliable communication stream between
the two computers, using the Internet
Protocol.
XML
eXtensible Markup Language: A
document formatting language which
describes a standard syntax, but
allowing many different document types.
Business partners can then agree on the
specific documents they will exchange,
using the standard syntax. XML
documents contain a hierarchical list of
tags, some of which contain values.
Page 49

XCOM File Transfer - iLink

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