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From: fair@ucbarpa.Berkeley.EDU (Erik E. Fair)
Newsgroups: sci.crypt
Subject: Re: Decryption Program
Message-ID: <16191@ucbvax.BERKELEY.EDU>
Date: Sun, 19-Oct-86 21:52:32 EDT
Article-I.D.: ucbvax.16191
Posted: Sun Oct 19 21:52:32 1986
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There is a program in the netnews distribution called `caesar.c' that
will decrypt substitution ciphers by frequency analysis from an english
language letter frequency table. This was used in the early days of the
USENET to decrypt "rotated" articles with arbitrary letter rotation
(this was before "rot13" became the accepted convention for scrambling
potentially offensive jokes). I just checked, and it's still in the
2.11 netnews distribution.

	Erik E. Fair	ucbvax!fair	fair@ucbarpa.berkeley.edu