Page:Curiosities of Olden Times.djvu/38

Curiosities of Olden Times eight times, and has seven various signs. Indeed the same letter is scarcely ever represented by the same figure; but this is not all: the character which appears in the place of i takes that of n shortly after; another symbol for n stands also for t. How any man could have solved the mystery of this cypher is astonishing.

Now let me recommend a far simpler system, and one which is very difficult of detection. It consists of a combination of numbers and letters. Both parties must be agreed on an arrangement such as that in the second line below, for on it all depends.

1 2 3 4 5 6 7 8 9 10 4 7 2 9 1 10 5 3 6 8 Now in turning a sentence such as "The army must retire" into cypher, you count the letters which make the sentence, and find that T is the first, H the second, E the third, A the fourth, R the fifth, and so on. Then look at the table. T is the first letter; 4 answers to 1; therefore write the fourth letter in the place of T; that is A instead of T. For h the second, put the seventh, which is y; for E, take the second, h. The sentence will stand "Ayh utsr emma yhutsr." It is all but impossible to discover this cypher.

All these cryptographs consist in the exchange of numbers or characters for the real letters; but there are other methods quite as intricate, which dispense with them. 26