CAESAR(6) BSD Reference Manual CAESAR(6)
caesar, rot13 - decrypt caesar cyphers
caesar [rotation] rot13
The caesar utility attempts to decrypt caesar cyphers using English letter 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 specif- ic rotation value. If this utility is invoked as rot13, it will rotate by 13 characters. This format is commonly used on USENET and in some of the databases used by the fortune(6) program to "disguise" their content. 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). MirOS BSD #10-current November 16, 1993 1
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