Sub Keys versus Session Keys

Gerd Ewald Gerd Ewald <>
Wed Mar 20 20:22:01 2002

Hello David,

On Wed, 20 Mar 2002 16:58:42 -0000 GMT your local time,
which was 20.03.2002, 17:58 (GMT+0100) where I live, you wrote:


> Is this a difference between PGP and GnuPG, or due to using ElGamal instead
> of RSA, or what ?


Not at all. The session key is needed for encrypting the message using
one of the symmetric algorithms (CAST, 3DES, Rijndael or whatever...).
This key should _not_ be used again (this is what good cryptographers

RSA or any other asymmetric algorithm is used to encrypt the session
key with the public key of the recipient.

Best regards,
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