Symmetric Encryption Requirement

Mark Jacobs mark.jacobs at
Fri Dec 19 10:53:22 CET 2003

On Friday 19 December 2003 10:41 am, David Shaw wrote:


> You can get the key with --show-session-key and write it to a file
> however you like, but it is unlikely you will be able to decrypt the
> data without doing some work, as OpenPGP programs use a special
> "OpenPGP cipher feedback mode" which may not be supported by your
> generic 3DES implementation.

Is this special mode described anywhere other than the source code? Is there
a way to request generic 3DES?
> Why not just run GnuPG on the mainframe?

The mainframe process that we are looking for is by the nature of the
mainframe a batch process without human interaction, i.e. hard for the
mainframe to enter a passphrase when prompted by GNUPG.

Also GNUPG has not been ported to run in the mainframe UNIX or
native environment.

> David

Mark Jacobs
Time Customer Service, Tampa FL
Time Warner


What are the facts? Again and again and again --- 
what are the facts? Shun wishful thinking, ignore 
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avoid opinion, Care not what the neighbors think, 
never mind the unguessable "verdict of history" --- 
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