pgp keys in gnupg: IDEA need for all recipients?

Werner Koch wk at
Thu Jun 30 12:35:22 CEST 2005

On Thu, 30 Jun 2005 11:23:17 +0200, Mark Kirchner said:

> Yes, as long as your key requires the use of IDEA-encryption,
> everybody who's trying to encrypt to you has to use an IDEA-enabled

Nope.  IDEA is an optional algorithm in OpenPGP.  All OpenPGP
compliant applications will use 3DES as the default algorithm if there
are no preferences defined.

Obviously you can't decrypt archived messages without having IDEA.
You better keep an old copy of pgp 2.6 around.

When migrating to gpg the best soultion is to set the passphrase to
empty using pgp2, export and import the secret key into gpg and set
the passphrase again so that it gets protected using a modern



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