Random seed for symetric encryption

[Christoph Anton Mitterer]

Nikolaus Rath wrote:

>Now I wonder why gpg needs random data for symetric encryption. Should
>I care about the message or not? And how can I make it disappear?
>  
>
As far as I know, even for symmetric encryption gnupg uses a session key
package, which is than encrypted via s2k-algorithms (your passphrase and
salt and so).

See section 5.3 of the standard
(http://www.ietf.org/internet-drafts/draft-ietf-openpgp-rfc2440bis-15.txt).

The reason for doing so is mainly that you can specify more than one
recipents.

The standard would also allow to directly use the s2k-generated key, but
I don't know wheter or not gpg support this.

Chris.