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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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