CAESAR(6)                    BSD Reference Manual                    CAESAR(6)

NNAAMMEE
     ccaaeessaarr - decrypt caesar cyphers

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 cyphers 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 Ar 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 for-
     tune(6) program are rotated by 13 characters.

4.4BSD                         November 16, 1993                             1