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CAESAR(6)                      BSD Games Manual                      CAESAR(6)

NAME
     caesar, rot13 -- decrypt caesar ciphers

SYNOPSIS
     caesar [rotation]

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.

     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