Signals intelligence (SIGINT) is an integral part of military strategy. Referring to the interception and decoding of enemy communications, SIGINT is the topic of Peter Matthew's 2013 publication, SIGINT: The Secret History of Signals Intelligence 1914-1945. Matthew focuses on the history of SIGINT until the Cold War. What makes SIGINT: The Secret History of Signals Intelligence unique is that the author presents the Axis point-of-view on SIGINT. As Matthew (2013) puts it, the author's aim is "to tell the other side of the Bletchley Park story," (p. 16).
A brief introduction describes what SIGINT is and how it evolved through technological and strategic changes. SIGINT is related to cryptography, because it encompasses the decoding of encrypted messages. The author points out that the book will be emphasizing Bletchley Park and Ultra, which were instrumental in bringing about the Allied Victory in the Second World War. Moreover, the author is interested in discussing SIGINT from the enemy's perspective: including Enigma and Lorenz (both Germany), Hagelin (Italy) and Purple (Japan). These were enemy coding machines, which Bletchley Park infiltrated.
The author also shows how SIGINT transformed the nature of espionage throughout the First and Second World Wars, in addition to being instrumental in determining the outcomes. Furthermore, the author uses the introduction to show how SIGINT is unique because cryptographers remain unsung heroes often for years after a war...
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