Date: Wed, 29 Sep 1993 08:56:21 -0600 (MDT) From: Michael Johnson <mpj@csn.org> Subject: Re: Carl Ellison on 'The Death of DES' To: Mike McNally <m5@vail.tivoli.com> In-Reply-To: <9309291229.AA11549@vail.tivoli.com> Message-Id: <Pine.3.05.9309290818.A2965-b100000@teal.csn.org>
In other words, des | tran really isn't much stronger than des
des | tran is exactly as secure as des. A final tran adds nothing. It looks messed up to a human, but there's no cryptographic value added. tran is of value *only* between two strong ciphers and its only value is to increase the size of the block affected by the surrounding ciphers.
, but des|tran|des|tran|des|tran|des|tran... could be quite strong (not to mention slow).
Try the new tran. The one originally posted had a slow (LC) PRNG. The new one uses subtract-with-borrow and it's faster. Another consumer warning: the s-w-b PRNG has a huge period but that doesn't make it cryptographically secure. If anything, this is probably the easiest PRNG to break. - Carl