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Subject: Re: q&d comparison (was Re: [Cryptix-Users] Rijndael - the real work now begins)
From: Paulo S. L. M. Barreto (paulo.barretoterra.com.br)
Date: Sun Oct 08 2000 - 14:53:46 CDT

On Sun, 08 Oct 2000, Ben Laurie wrote:
> Ian Grigg wrote:
> > On the amount of entropy, well, I'd leave that to a cryptographer,
> > other than the observation that Rijndael has 128, 192, 256 bit keys,
> > whilst DES has 56 bits and T-DES has 168 (full).
>
> Nnng. I know you know this, but the triple DES key is only worth 112
> bits. Which is why there is no double DES.

And DES is only worth 43 bits due to linear attacks (hence by today's standards
I'd say DES is a broken cipher, irrespective of the short key size).

Paulo.