Useful for determining if cyphertext is simple transposition (instead of substitution).
| Vowels, with or without Y | about 40% (with variation between 35% and 45%) |
| Consonants: L N R S T | about 30% (with variation between 25% and 35%) |
| Consonants: J K Q X Z | about 2% (may be influenced by nulls) |
Useful for determining if cyphertext is simple 1:1 substitution
| E | 1231 |
| T | 959 |
| A | 805 |
| O | 794 |
| N | 719 |
| I | 718 |
| S | 659 |
| R | 603 |
| H | 514 |
| L | 403 |
| D | 365 |
| C | 320 |
| U | 310 |
| P | 229 |
| F | 228 |
| M | 225 |
| W | 203 |
| Y | 188 |
| B | 162 |
| G | 161 |
| V | 93 |
| K | 52 |
| Q | 20 |
| X | 20 |
| J | 10 |
| Z | 9 |
| %V | %C | %V | %C | |||
| 19 | 81 | F(4) L(4) C(5) D(5) M(5) N(6) S(6) W(7) T(8) R(8) E(11) H(14) | A | N(21) T(17) S(12) R(10) L(8) D(5) C(4) M(4) | 6 | 94 |
| 55 | 45 | Y(4) B(4) N(5) T(5) U(8) D(9)O(9) S(10) A(16) E(16) | B | E(34) L(17) U(11) O(9) A(7) Y(5) B(4) R(4) | 70 | 30 |
| 61 | 39 | U(4) O(5) S(8) N(13) A(13) I(18) E(20) | C | H(19) O(19) E(17) A(13) I(7) T(6) R(4) L(4) K(4) | 59 | 41 |
| 52 | 48 | R(4) I(5) L(6) A(10) N(29) E(39) | D | E(16) I(14) T(14) A(10) O(8) S(6) U(5) | 54 | 46 |
| 8 | 92 | C(4) B(4) E(5) M(5) V(5) D(5) S(5) L(5) N(6) T(6) R(11) H(24) | E | R(15) D(10) S(9) N(8)A(7) T(6) M(5) E(4) C(4) O(4) W(4) | 21 | 79 |
| 69 | 31 | S(4) N(5) F(5) D(5) A(6) I(7) E(12) O(41) | F | T(22) O(21) E(10) I(9) A(7) R(5) F(5) U(4) | 52 | 48 |
| 36 | 64 | O(4) D(4) U(5) R(5) I(9) E(9) A(10) N(48) | G | E(14) H(14) O(12) E(10) A(8) T(6) F(5) W(4) I(4) S(4) | 42 | 58 |
| 7 | 93 | O(4) E(5) W(5) S(7) C(9) T(62) | H | E(50) A(23) I(12) I(7) | 90 | 10 |
| 13 | 87 | F(4) M(4) W(5) E(6) N(6) L(8) D(8) S(8) R(9) H(11) T(14) | I | N(25) T(13) S(10) O(8) C(7) R(4) E(4) M(4) A(4) L(4) | 17 | 83 |
| 28 | 72 | Y(7) W(7) T(7) S(7) N(7) E(7) C(7) B(7) A(14) M(29 | J | U(35) O(29) A(12) E(12)M(6) W(6) | 88 | 12 |
| 53 | 47 | Y(5) U(5) I(5) N(7) A(11) R(13) E(13) O(15) C(18) | K | E(34) I(21) N(10) A(9) T(7) S(6) | 68 | 32 |
| 52 | 48 | N(4) P(4) T(6) I(7) B(7) U(7) O(10) E(11) L(11) A(17) | L | E(19) I(15) Y(12) L(12) O(9) A(8) D(7) U(4) | 65 | 35 |
| 39 | 31 | S(4) D(4) M(5) R(5) I(12) A(13) O(16) E(24) | M | E(26) A(17) O(12) I(11) P(5) M(5) | 71 | 29 |
| 89 | 11 | U(7) E(14) O(22) A(23) I(24) | N | D(16) T(14) G(12) E(10) A(7) S(7) O(7) I(6) C(5) | 32 | 68 |
| 21 | 79 | M(4) O(4) D(4) L(4) P(4) H(5) N(6) E(6) C(7) F(7) S(8) I(8) R(9) T(11) | O | N(20) F(14) R(11) U(10) T(6) M(5) L(5) S(4) W(4) O(4) | 18 | 82 |
| 47 | 53 | R(4) L(4) T(4) N(4) I(4) P(6) M(6) A(7) O(8) U(10) E(16) S(17) | P | O(17) E(16) A(15) R(15) L(8) U(6) P(6) T(5) I(5) S(4) | 59 | 41 |
| 20 | 80 | O(10) N(10) L(10) E(10) D(10) R(20) S(30) | Q | U(100) | 100 | -- |
| 70 | 30 | P(5) I(5) U(5) T(7) A(13) O(16) E(30) | R | E(23) O(12) A(11) T(11) I(10) S(7) Y(4) | 61 | 39 |
| 48 | 52 | D(4) T(4) O(6) U(6) R(7) N(8) S(9) I(11) A(16) E(18) | S | T(19) E(11) O(10) I(9) S(9) A(8) H(6) P(5) U(4) | 41 | 49 |
| 43 | 57 | U(4) O(5) D(6) T(6) F(7) R(7) E(8) I(10) N(10) S(13) A(14) | T | H(39) I(10) O(10) E(8) A(7) T(6) R(4) | 38 | 62 |
| 35 | 65 | P(5) F(5) T(5) L(5) B(6) D(8) S(9) O(30) | U | N(18) S(13) T(13) R(12) L(10) P(7) B(4) C(4) | 8 | 92 |
| 88 | 12 | R(6) U(10) O(16) A(16) I(16) E(30) | V | E(65) I(14) O(9) A(8) | 99 | 1 |
| 48 | 52 | G(4) D(4) Y(5) N(9) S(10) T(11) O(16) E(23) | W | A(27) H(16) I(16) E(15) O(11) N(4) | 80 | 20 |
| 95 | 5 | U(5) N(5) I(16) E(74) | X | P(29) T(19) I(14) A(14) U(10) C(5) K(5) O(5) | 38 | 62 |
| 24 | 76 | B(4) N(8) A(8) T(13) E(14) R(15) L(25) | Y | A(15) O(12) S(12) T(9) W(7) H(5) I(5) E(5) D(4) M(4) B(4) | 38 | 62 |
| 88 | 12 | O(12) N(12) A(25) I(50) | Z | E(43) I(43) W(14) | 86 | 14 |
All figures indicate percentages. - Taking any one letter, as A: On the left, it is contacted 14% of the time by H, 11% by E, etc., and 81% of its total contacts on that side were consonants. On the right, it was contacted 21% of the time by N, and 94% of the time by consonants.
Taken from Cryptanalysis: A Study of Cyphers and their Solutions by Helen Fouche Gainess