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"Operation Ultra was designed to intercept and decode German signals sent using Enigma, the top-secret German cypher machine. F.W. Winterbotham, was the man responsible for the organization, distribution and security of Ultra. This is his personal account of the operation."
Apparently one of the best books on the cryptography situation in WWII - just started, and a little dry so far. Still, I'm always looking for good books on the subject, it's a sort of pet passion, so will continue forth.
The Ultra Secret | 
