Infere key frm plaintext and exncrypted version?

[David Shaw]

On Fri, Aug 29, 2003 at 03:58:46PM +0200, Ruediger Kupper wrote:
> Hello,
> 
> you probably heard this question before on this list, but
> please allow me to ask again:
> 
> If someone manages to get his hands on the plain as well as
> the encrypted version of the same text, does this enable him
> to infere the encryption key?

No.  This is a "known plaintext attack", and all of the algorithms
used in GnuPG are resistant to such attack.

David