Colossus: Bletchley Park's Greatest Secret, Paul Gannon, c. 2006
Early WWI, 1914, German naval codes -- link here.
Early in 1914, the Allies had three of the codebooks: SKM, HVB, and VB.
Colossus: Bletchley Park's Greatest Secret, Paul Gannon, c. 2006
Early WWI, 1914, German naval codes -- link here.
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