CAESAR(6)                      BSD Games Manual
CAESAR(6)

NNAAMMEE
     ccaaeessaarr, rroott1133 — decrypt caesar
     ciphers

SSYYNNOOPPSSIISS
     ccaaeessaarr [_r_o_t_a_t_i_o_n]

DDEESSCCRRIIPPTTIIOONN
     The ccaaeessaarr utility attempts to decrypt caesar
     ciphers using English let‐ ter frequency statistics.
     ccaaeessaarr reads from the standard input and
     writes to the standard output.

     The optional numerical argument _r_o_t_a_t_i_o_n
     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
