AES for GnuPG, on Mon Oct 2?

Simpson, Sam s.simpson at
Mon Oct 2 15:46:03 CEST 2000

Hitachi actually claim that their patent covers all entries other than
Rijndael (see for example the 2 Hitachi letters at:

My opinion is that it's a 2 horse race between Serpent and Twofish (Rijndael
needs more rounds, RC6 & MARS are awful on some platforms).  IMHO, Twofish
is just too complicated to be analysed sufficiently, leaving the highly
tweakable and incredibly conservative Serpent.

I could be wrong though ;)


Sam Simpson

> -----Original Message-----
> From: Michael H. Warfield [mailto:mhw at]
> Sent: 02 October 2000 14:39
> To: Simpson, Sam
> Cc: Mark Atwood; gnupg-devel at
> Subject: Re: AES for GnuPG, on Mon Oct 2?
> On Mon, Oct 02, 2000 at 12:49:45PM +0000, Marc Mutz wrote:
> > Mark Atwood wrote:
> > <snip>
> > > What would be cool is if someone has
> > > written "AES modules" for all 4 of the finalists,
> > <snip>
> > It's _five_ finalists (though I agree that MARS will 
> unlikely stand the
> > competition and is effectively out of the race). They are (with my
> > opinions added in parantheses)
> > 1) MARS (too slow, too small security margin)
> > 2) RC6  (patented - ugh)
> > 3) Twofish (complicated)
> > 4) Rijndael (only with increased round count)
> > 5) Serpent (will make it :-)
> 	Serpent apparently is subject to a claim by Hitachi 
> that it holds
> a patent over some aspect of it.  Rumor has it that it's out 
> of the race.
> That's based on a coderpunks posting which I have not been able to
> independently verify.
> > Marc
> > -- 
> > Marc Mutz <Marc at>
> University of Bielefeld, Dep. of Mathematics / Dep. of Physics

> PGP-keyID's:   0xd46ce9ab (RSA), 0x7ae55b9e (DSS/DH)

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