1943 BRUSA Agreement

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The 1943 BRUSA Agreement (Britain–United States of America agreement)

Government Code and Cypher School
(GC&CS). It followed the 1942 Holden Agreement.

History

Sinkov mission

The

Government Code and Cypher School headquarters at Bletchley Park, England. They met British "codebreakers", including Alan Turing, and negotiated an agreement to collaborate on cryptological work (see Ultra). Some information was shared by the British about their work on cryptanalysis of the Enigma machine.[2][3]

Holden Agreement

The Holden Agreement of October 1942 gave the United States overall responsibility for Japanese naval codes, although with continued British participation.[4]

The agreement specifically stated that

FRUMEL the Australian naval codebreaking establishment run by USN Lieutenant Rudolph (Rudy) Fabian. Fabian thought Nave had breached security with his desire to share information with the Army Central Bureau, where Nave transferred to (and was welcomed).[4]

BRUSA Agreement

Colonel

Purple machine.[5]

This led to the signing of the 1943 BRUSA Agreement on 17 May, which was a formal agreement to share intelligence information. It covered:

  • the exchange of personnel;
  • joint regulations for the handling and distribution of the highly sensitive material.

The security regulations, procedures and protocols for co-operation formed the basis for all signals intelligence (

SIGINT) activities of both the US National Security Agency and the British GCHQ
.

UKUSA Agreement

The agreement was formalized by the UKUSA Agreement in 1946. This document was signed on 5 March 1946 by Colonel Patrick Marr-Johnson (who had headed the Wireless Experimental Centre in Delhi during the war) for the U.K.'s London Signals Intelligence Board and Lieutenant General Hoyt Vandenberg for the U.S. State–Army–Navy Communication Intelligence Board.[6]

See also

References

  1. Oxford Dictionary of National Biography
    , Oxford University Press, 2004
  2. ^ Dufty 2017, p. 66.
  3. ^ "How the British and Americans started listening in". BBC News. 8 February 2016. Retrieved 2 April 2023.
  4. ^ a b Dufty 2017, p. 177.
  5. ISBN 9780385352666
    .
  6. ^ "Diary reveals birth of secret UK-US spy pact that grew into Five Eyes". BBC News. 5 March 2021. Retrieved 2 April 2023.

Bibliography

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