ULTRA

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ULTRA was a code word for British communications intelligence (COMINT) in the Second World War, primarily targeted against the German Enigma machine and its derivatives. [1]. The COMINT organization was called the Government Code and Cipher School (GCCS), which reported to the Secret Intelligence Service. Eventually, GCCS became a separate organization, the Government Communications Headquarters, with functions similar to the Canadian Communications Security Establishment or the U.S. National Security Agency.

Bletchley Park and the early days

Special Liaison system

Early cryptanalytic automation

References

  1. Winterbotham, F.W. (2000), The Ultra Secret, Orion