This British counter intelligence programme of inserting false information into radio traffic which the British knew the Germans could read, helped to sustain and confirm the German belief that Enigma codes could NOT be broken.
: A report of 10/7/44 signed by Admiral Stummel
: (Director of Naval Communications) read as
: follows, stating emphatically that in four
: and a half years of war: ' .... No trace or
: even a hint has been offered by our
: cryptanalytic work, (that is, decrypts of
: Allied signals) of any results of the
: deciphering of our own main procedures.
: Conclusion, that Allied decryption of Enigma
: has been unsuccessful and current reading is
: My note; There are several thousand words
: that describe the many investigations
: undertaken by the German security and Naval
: Communications department, all of which came
: up with the same conclusion.
: --Previous Message--
: It is known if and how the Germans reacted?
: In both World Wars the navy made the error
: to assume that their codes could not be
: broken and used similar systems to the end
: of the war.