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The Invisible Cryptologists: African-Americans, WWII to 1956 by Jeannette Williams

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Chapter 5. 1948–1951: The Dark Side of the Golden Age of Russian Plain Text

The development and expansion of the traffic processing unit are inextricably linked to the tremendous dependence on the exploitation of Russian communications for intelligence following Black Friday. That day, 25 August 1948, the chief of the Soviet General Staff declared that "the transmission of . . . messages is permitted only by landline." Within weeks, Soviet communications systems that had been successfully exploited since 1945 went off the air. The series of communications changes that began in November 1947 and culminated on Black Friday were catastrophic. Out of this devastation, Russian plaintext communications emerged as the critical provider of intelligence ...

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