Colossus: Bletchley Park’s Greatest Secret, by Paul Gannon, Atlantic Books, €36.50.
Effective communications are critical to effective warfare, but the more sophisticated the method of relaying messages is, the more it can be effectively exploited by the other side.
Gannon takes a critical look at the decryption work carried out in Bletchley Park, the British army’s codebreaking headquarters, which was situated at a railway juncture 50 miles north west of London during World...
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