Re: [OT] Interference by multiple encryption.

[Florian Reitmeir <fr@xxxxxxxxx>]

On Son, 30 Okt 2005, Jan Luehr wrote:

> Hello,
> 
> Am Sonntag, 30. Oktober 2005 02:55 schrieb Florian Reitmeir:
> > Hi,
> [...]
> > http://www.cacr.math.uwaterloo.ca/hac/
> >
> > there are some criterias for ciphers by design which answer your querstion:
> >
> > - the cipher output should be random, so there is no way to guess the
> > cipher itself, nor the original content
> 
> This is rather logical.
> Considering this, I don't understand how / why does gnupg know what cipher is 
> used (aes, twofish, etc.) if I try to decrypt symmetric encrypted data (at 
> least)?

everything needed to decrypt the content is added to the message (ciphers, 
content encoding,...), the only thing additional needed is the 
"passphrase/key".

Maybe you like to read: http://en.wikipedia.org/wiki/Pretty_Good_Privacy

-- 
Florian Reitmeir

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