[2845] in cryptography@c2.net mail archive
Matt Blaze: difference distribution table for Skipjack
daemon@ATHENA.MIT.EDU (Perry E. Metzger)
Wed Jun 24 20:19:13 1998
To: cryptography@c2.net
Date: Wed, 24 Jun 1998 20:18:17 -0400
From: "Perry E. Metzger" <perry@piermont.com>
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I thought this would be of interest to those examining the algorithm.
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Content-Type: message/rfc822
Message-Id: <199806242354.TAA23394@fbi>
To: coderpunks@toad.com
Subject: difference distribution table for Skipjack
Date: Wed, 24 Jun 1998 19:54:23 -0400
From: Matt Blaze <mab@research.att.com>
I've generated the 256x256 difference distribution table for
the Skipjack F function. This table gives the number of
times each possible output XOR differential occurs for each possible
input differential. It is in the format of Appendix B of
Biham and Shamir's DES book, and is a simple ASCII table.
The table is BIG (65536 entries - 200K bytes). You can ftp it from:
<ftp://ftp.research.att.com/dist/mab/sj.dist>
There are a few surprising spikes in the table, but they probably
disappear after a few rounds. I haven't done anything beyond
generating the table yet.
(If you don't know what a difference distribution table is
good for, you won't be able to make much use of this one
until you understand differential cryptanalysis at the
level of Biham and Shamir's book).
-matt
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