[1109] in cryptography@c2.net mail archive
Re: cracking n-DES?
daemon@ATHENA.MIT.EDU (Carl Ellison)
Fri Jun 27 23:43:59 1997
Date: Fri, 27 Jun 1997 23:22:31 -0400
To: Steve Bellovin <smb@research.att.com>
From: Carl Ellison <cme@cybercash.com>
Cc: cryptography@c2.net
In-Reply-To: <199706272331.TAA08744@smb.research.att.com>
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There are several reasons I have advocated the combination
des|tran|des|tran|des
if you want really serious multiple-DES. Not only is the effective block
size huge (fighting known plaintext fragment attacks) but any known
headers from prior DES output blocks are lost in the noise. Of course,
people can use even dtdtd stupidly -- e.g., by using the same key for each
instance of DES.
For those interested, tran is avbl in source off the end of my home page.
- Carl
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