[87716] in Cypherpunks
Re: Quor's cipher
daemon@ATHENA.MIT.EDU (Anonymous)
Sun Oct 5 18:20:35 1997
Date: Sun, 5 Oct 1997 22:58:59 +0200 (MET DST)
To: cypherpunks@cyberpass.net
From: nobody@replay.com (Anonymous)
Reply-To: nobody@replay.com (Anonymous)
Matthew Ghio wrote:
> Antonomasia <ant@notatla.demon.co.uk> wrote:
>
> > How are you planning to detect which bytes are passed in this way ?
> > Chosen plaintext attacks would do it, and show where (a+b)^(a0+b0) == 0.
> > Looks like you've just doubled our progress.
>
> It doesn't take chosen plaintext, just known plaintext.
Even in the case where this doesn't work, you can simply collect all
128 plaintext/ciphertext pairs for the first byte (if you can get
enough known plaintexts)
