From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 14 Apr 2005 00:05:30 +0200 From: "Devon H. O'Dell " To: 9fans@cse.psu.edu Subject: Re: [9fans] crypto question Message-ID: <20050413220530.GD13046@smp500.sitetronics.com> References: <20050413192328.GA13046@smp500.sitetronics.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="NtwzykIc2mflq5ck" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.8i Topicbox-Message-UUID: 39070500-ead0-11e9-9d60-3106f5b1d025 --NtwzykIc2mflq5ck Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 13, 2005 at 06:01:36PM -0400, Karl Magdsick wrote: > > Doesn't p9sk1 still use DES? DES was nice, but has several > > recognized ways to speed up cryptanalysis of the algorithm. 3DES > > is an alternative, but with combinations such as Rijndael-256 in > > CBC mode (or indeed, using a strong stream cipher -- Helix looks > > neat, but it's still too new, I think), I really don't see why > > we should stick with these things. >=20 > FYI, sufficiently useful quadratic approximations (XSL attack) of AES > exist to reduce all key lengths of AES to equivalent of no more than > 128-bit strength. These attacks will likely be improved in the > future. The same class of attacks reduces Serpent to no more than > equivalent 192-bit key strength. The key-dependent substitution > tables used in TwoFish appear to make it immune to this sort of > attack. If you're going to pick an AES finalist block cipher, TwoFish > now appears to be the strongest of the AES finalists (especially the > legally unencumbered ciphers), despite Rijndael being chosen for AES. >=20 > -Karl Aha, that's quite interesting to know. Do you have any information about attacks on Serpent (which also appears to be quite strong, at least from what its webpage would have you believe)? --Devon --NtwzykIc2mflq5ck Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCXZeqSkf3jVXOdl0RAlVtAJ9QzQ8hXE68t/1luE6h57E0yyXGVwCeI9+R 7VJNMZWMT+ugfO0RPrC6sOw= =bxj1 -----END PGP SIGNATURE----- --NtwzykIc2mflq5ck--