decrypting pgp with gpg

Werner Koch
Fri, 15 Sep 2000 10:43:46 +0200

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 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 -- Archive is at - Unsubscribe by sending mail with a subject of "unsubscribe" to