equals
| R | E | I | N | F | O | R | C | E | M | E | N | T | S |
then, with cipher disk, A equals
| P | E | R | M | A | N | E | N | T | B | O | D | Y | P |
and, in Vigenere cipher, A equals
| H | W | F | M | Q | L | W | J | L | D | G | D | M | F |
It is evident that the guess as to the appearance of the word REINFORCEMENTS was correct, that it is the first word of the message, that the cipher disk was used in preparing the cipher and that the key words are PERMANENT BODY.
This is, of course, an especially favorable case and we will take one less favorable to show how this method can be applied.
Two Mexican chieftains, A and B, have been communicating with the following cipher alphabet:
| Plain text | ABCDEFGHIJLMNOPQRSTUVXYZ |
| Cipher | PCJVRQZBAODFSUTMXIYHLGEN |