decrypting pgp with gpg

[Werner Koch]

On Fri, 15 Sep 2000, Ole Bents wrote:

> gpg: cipher algorithm 1 is unknown or disabled

This is IDEA and not supported by GnuPG.  I guess that you created
your key using PGP which then includes IDEA in it's preferences.
The sender'ss implementaion then assumes, you are able to decrypt
IDEA and sends the message IDEA encrypted.

The best way to avaoid this is by changing the preferences of your
public key using either PGP (you can select them somewhere) or GnuPG:
Change the expiration date of your key and the default GnuPG
preferences will be written. (you may want to change the expiration
date back to the original value later).  

gpg --edit your-key

the "expire"

Don't forget to send your updated public key to your communication
partner.

The other way is by using the idea module which is available at
ftp://ftp.guug.de/gcrypt/contrib/idea.c
The file contains instruction on how to compile and install it.
Using this module is not legal in most countries unless you have 
a license to use IDEA.


Hth,

  Werner


-- 
Werner Koch				GnuPG key:  621CC013
OpenIT GmbH                             http://www.OpenIT.de

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