The Newmanry History

41C Page 298

It was argued that if a pair of messages (a,b,) with the same indicators

Now when the sums Za + Zb were formed for a number of depths of two it was

The proof was completed when about 15 letters of one of the depths were

The first attempts to reconstruct long key-sequences from depths of two were

For in the process of depth breaking the first step is to construct the

In the depths which were first attacked, the clear language obtained was not

It is not surprising therefore that for some time little progress was made

On 30th August, 1941 the German cipher operators came to the rescue.

On that date two very long messages, with the same indicators HQIBPEXEZMUG

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