Decoder skilled in the analysis of codes and cryptograms

Usage examples of cryptanalyst.

But how can a cryptanalyst tell which messages are important until he has solved them?

Hour after hour, day after day, sometimes month after month, the cryptanalyst tortures his brain to find some relationship between the letters that hangs together, does not dead-end in self-contradiction, and leads to additional valid results.

Rowlett, the civilian cryptanalyst in charge of the Japanese diplomatic solutions, checked and rechecked to see whether one of the stations had picked it up and had somehow neglected to forward it.

The story is not without a certain bitter irony, however, for Gorgo, who may be considered the first woman cryptanalyst, in a way pronounced a death sentence on her own husband: Leonidas died at the head of the heroic band of Spartans who held off the Persians for three crucial days at the narrow pass of Thermopylae.

The cryptanalyst can utilize the known frequencies to dislodge the text from the cipher.

English, the cryptanalyst will count the number of letters in the ciphertext.

The cryptanalyst, examining his statistics and finding three high-frequency letters that avoid one another, could assume that they represent the vowels.

This information permits the cryptanalyst to sort the letters of the cryptogram so that all those enciphered with the first keyletter are brought together in one group, all those enciphered with the second keyletter in another group and so forth.

The cryptanalyst must align these one above the other so that letters enciphered with the same keyletter will fall into a single column.

January 17, 1917, the Reverend William Montgomery, a thin, gray-haired scholar of the early church fathers who was serving as a cryptanalyst in the diplomatic section of Room 40, came to tell Hall of what looked like an important message.

But where the cryptanalyst of cipher deals with only 26 such elements, the cryptanalyst of code must keep his eye on hundreds or thousands, whose characteristics, moreover, because of their reduced frequency, are much scantier and more diffuse than the sharply defined traits of letters.

The large orderly segments considerably help the cryptanalyst, though his guesses are not as delimited as in a one-part code.

Moreover, probable words would enable the cryptanalyst to recover the secondary key.

Some systems are unbreakable in practice only, because the cryptanalyst can conceive of ways of solving them if he had enough text and enough time.

No matter how much text a cryptanalyst had available in it, or how much time he had to work on it, he could never solve it.