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CAESAR(6) BSD Games Manual CAESAR(6) NAME caesar, rot13 -- decrypt caesar ciphers SYNOPSIS caesar [rotation] rot13 DESCRIPTION The caesar utility attempts to decrypt caesar ciphers using English let- ter frequency statistics. Caesar reads from the standard input and writes to the standard output. The optional numerical argument rotation may be used to specify a spe- cific rotation value. If invoked as rot13, a rotation value of 13 will be used. The frequency (from most common to least) of English letters is as fol- lows: ETAONRISHDLFCMUGPYWBVKXJQZ Their frequencies as a percentage are as follows: E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), H(5.2), D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2), P(1.9), Y(1.9), W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07). Rotated postings to USENET and some of the databases used by the fortune(6) program are rotated by 13 characters. BSD November 16, 1993 BSD
NAME | SYNOPSIS | DESCRIPTION
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