“It is rare one comes across a book of this calibre written for lay readers, so very informative and so good in its level of intelligence that borders on testing.

In discussing codes he goes into history and discusses various codes used historically until one reaches Enigma and realises why it was so prized as to have British intelligence and government risk loss of many lives rather than allow the enemy to suspect that they had in fact cracked it or obtained a key, a variation of...”

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