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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:17:37
Sandy Harris (sandy.harris@sympatico.ca)
Mon, 07 Dec 1998 17:40:02 -0500
Bruce Schneier wrote:
>
> At 12:43 PM 12/7/98 +0100, Mok-Kong Shen wrote:
> >In Bruce Schneier's book on p.289 it is stated:
> >
> > Differential analysis works against DES and other similar
> > algorithms with constant S-boxes. The attack is heavily
> > dependent on the structure of the S-boxes.
> >
> >On the otherhand it is known (see www.counterpane.com) that
> >V. Rijmen did a differential analysis of Blowfish whose S-boxes
> >are non-constant. Would someone please explain this apparent paradox?
>
> I don't think there's any real "paradox." . . .
[big snip]
> >I should also appreciate to be able to see a very brief sketch of
> >the technique of Rijmen and an explanation why that can't be extended
> >to work against Blowfish with more than 4 (a fixed number!!)
> >rounds as claimed in the Web page cited above.
>
> Unfortunately, it's in Rijmen's PhD thesis. I don't believe there is a
> copy online, and that section was never published. I have a copy
> in my hands, but I don't have the time or patience to explain the
> attack. (Actually, it's a pretty obvious attack.)
http://www.esat.kuleuven.ac.be/~rijmen/publications.html
has lists of publications by year & links to online versions of
some of them. Try there & if that fails, consider mailing Rijmen.
Address should be on:
http://www.esat.kuleuven.ac.be/~rijmen
-- Sandy Harris sandy.harris@sympatico.ca Help secure the Internet: http://www.cygnus.com/~gnu/swan.html
The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:17:37