| 1 | CAESAR(6) BSD Reference Manual CAESAR(6) |
| 2 | |
| 3 | N\bNA\bAM\bME\bE |
| 4 | c\bca\bae\bes\bsa\bar\br - decrypt caesar cyphers |
| 5 | |
| 6 | S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS |
| 7 | c\bca\bae\bes\bsa\bar\br [_\br_\bo_\bt_\ba_\bt_\bi_\bo_\bn] |
| 8 | |
| 9 | D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN |
| 10 | The c\bca\bae\bes\bsa\bar\br utility attempts to decrypt caesar cyphers using English let- |
| 11 | ter frequency statistics. C\bCa\bae\bes\bsa\bar\br reads from the standard input and |
| 12 | writes to the standard output. |
| 13 | |
| 14 | The optional numerical argument Ar rotation may be used to specify a spe- |
| 15 | cific rotation value. |
| 16 | |
| 17 | The frequency (from most common to least) of English letters is as fol- |
| 18 | lows: |
| 19 | |
| 20 | ETAONRISHDLFCMUGPYWBVKXJQZ |
| 21 | |
| 22 | Their frequencies as a percentage are as follows: |
| 23 | |
| 24 | E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), |
| 25 | H(5.2), D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2), |
| 26 | P(1.9), Y(1.9), W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), |
| 27 | Q(.11), Z(.07). |
| 28 | |
| 29 | Rotated postings to USENET and some of the databases used by the for- |
| 30 | tune(6) program are rotated by 13 characters. |
| 31 | |
| 32 | 4.4BSD November 16, 1993 1 |