The Newmanry History

41B Page 297


41 THE FIRST BREAK

The first messages on the "Tunny" link ( the name "Tunny" was first given

Each message began with a clear preamble in which there appeared first the

On the assumption that a teleprinter machine was being used, two problem

Both these questions were answered by the study of a a series of corrupt

The second problems was then solved by a study of the corrupt clear

The next advance to be made was the demonstration that the cipher was a

This was made possible by the occurrence of a number of "depths of two",

The simplest assumptions to make seemed to be that a letter subtractor

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