Abstract
As early as 1931, Gustave Bertrand of the French
intelligence services received from the traitor Hans Thilo Schmidt documents
concerning the Enigma cipher machine. This machine was intended to equip all
the German military forces. This is the beginning of an epic that has probably
changed the History. The main documents collected by Bertrand have not been
destroyed and are available in the archives of the French Army (SHD). This
article describes and analyzes each of these documents, including the evolution
of the Enigma and its procedures related in these documents. In conclusion, the
article lists the findings that come from reading these originals and first and
foremost the impact of having a cipher message with its plaintext on the
British attempt to recover Enigma rotors wiring. Oddly enough, it seems that
this message was not used by the Poles to break the Enigma.
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