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What’s the context? Polish cryptologists reveal they have cracked the Enigma code, 26 July 1939

Posted by: , Posted on: - Categories: Foreign Office Historians, What's the context? series
The three Polish codebreakers Marian Rejewski, Jerzy Rozycki and Henryk Zygalski

...Polish Signals Bureau sent a coded message to his French counterpart on 30 June that ‘there is a new development’. This was not a cryptologic breakthrough, but a willingness to...