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• Catalogue level

  Piece

  Security of electronic communications

  Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Nov-1955 Aug

  Reference

  HW 9/42

• Catalogue level

  Piece

  W/T Interception Committee of Co-ordination Cryptography and Interception committee...

  W/T Interception Committee of Co-ordinationCryptography and Interception committee - became Coordination of W/T Interception Committee by January 1928. Chaired by the Chief of the Secret Service, the members were the Directors of Intelligence of the …

  Held by

  The National Archives, Kew

  Date

  1924 Jun 11-1938 Apr 28

  Reference

  HW 42/1

• Catalogue level

  Piece

  Financing of GCCS during transfer from Admiralty to Foreign Office, Nov 1921 - May...

  Financing of GCCS during transfer from Admiralty to Foreign Office, Nov 1921 - May 1922

  Held by

  The National Archives, Kew

  Date

  1921-1922

  Reference

  HW 3/42

• Catalogue level

  Piece

  Y Committees, Y Board and Sigint Board - organisations and origins

  Y Committees, Y Board and Sigint Board - organisations and origins

  Held by

  The National Archives, Kew

  Date

  1924 Jan 01-1945 Dec 31

  Reference

  HW 42/30

• Catalogue level

  Piece

  Papers relating to the Administrative and AT Subcommittees Minutes of meetings of...

  Papers relating to the Administrative and AT SubcommitteesMinutes of meetings of the Administrative Subcommittee, which was set up to oversee matters relating to accommodation, personnel, communications and the supply of technical equipment to the Y …

  Held by

  The National Archives, Kew

  Date

  1941 Apr 02-1943 Oct 13

  Reference

  HW 42/22

• Catalogue level

  Piece

  Traffic analysis against the French navy

  Traffic analysis against the French navy

  Held by

  The National Archives, Kew

  Date

  1942 Mar 23-1943 May 24

  Reference

  HW 18/42

• Catalogue level

  Piece

  Minutes of Y Subcommittee meetings, nos 108-183. Minutes of meetings 1-107 missing...

  Minutes of Y Subcommittee meetings, nos 108-183. Minutes of meetings 1-107 missing at transfer

  Held by

  The National Archives, Kew

  Date

  1935 May 08-1938 Sep 22

  Reference

  HW 42/4

• Catalogue level

  Piece

  German section: reports of German army and air force high grade machine decrypts

  German section: reports of German army and air force high grade machine decrypts

  Held by

  The National Archives, Kew

  Date

  Dec 3 1941-Dec 6 1941

  Reference

  HW 5/42

• Catalogue level

  Piece

  Commercial reports. Report number 11080 missing at transfer

  Commercial reports. Report number 11080 missing at transfer

  Held by

  The National Archives, Kew

  Date

  1940 Aug 08-1940 Aug 10

  Reference

  HW 29/42

• Catalogue level

  Piece

  Reports of decrypts of Japanese military attachés messages

  Reports of decrypts of Japanese military attachés messages

  Held by

  The National Archives, Kew

  Date

  1944 Jun 15-1944 Jun 22

  Reference

  HW 35/42

• Catalogue level

  Piece

  Romanian Special Service of Information reports on political, security and economic...

  Romanian Special Service of Information reports on political, security and economic matters including minority groups, especially the Jewish community

  Held by

  The National Archives, Kew

  Date

  1947 Apr 18 - 1947 May 07

  Reference

  HW 75/42

• Catalogue level

  Piece

  Decrypts of Japanese army and army air force messages

  Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1944 Sep 01-1945 May 01

  Reference

  HW 52/42

• Catalogue level

  Piece

  Weekly summary reports on Second World War German army and air force communications

  Weekly summary reports on Second World War German army and air force communications

  Held by

  The National Archives, Kew

  Date

  1944 Nov 12-1944 Dec 02

  Reference

  HW 45/42

• Catalogue level

  Piece

  Sigint Board, July - Aug 1945 - minutes of meetings and other papers Subjects discussed...

  Sigint Board, July - Aug 1945 - minutes of meetings and other papersSubjects discussed include: use of special intelligence by official historians post-war planning security of Signal Intelligence review of the development of Signal Intelligence Boar…

  Held by

  The National Archives, Kew

  Date

  1945 Jul 01-1945 Aug 17

  Reference

  HW 42/15

• Catalogue level

  Piece

  Sigint Board, July - Dec 1944 - minutes of meetings and other papers Subjects discussed...

  Sigint Board, July - Dec 1944 - minutes of meetings and other papersSubjects discussed include:dissemination of information from weather codes policy for conducting Sigint against Japan the security of signal intelligence revision of cover in the Med…

  Held by

  The National Archives, Kew

  Date

  1944 Jul 07-1944 Dec 22

  Reference

  HW 42/13

• Catalogue level

  Piece

  A, B and Y Committee papers The A Committee took over from the AT Subcommittee in...

  A, B and Y Committee papersThe A Committee took over from the AT Subcommittee in November 1943 and met until Aug 1944, when it was combined with the B Committee (qv), to form the Y Committee. Topics covered include the supply of equipment at home and…

  Held by

  The National Archives, Kew

  Date

  1943 Oct 29-1945 Oct 02

  Reference

  HW 42/28

• Catalogue level

  Piece

  Japanese naval decrypts

  Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1943 Nov 04-1943 Nov 05

  Reference

  HW 23/42

• Catalogue level

  Piece

  44669-46005

  44669-46005

  Held by

  The National Archives, Kew

  Date

  1942 Nov 16-1942 Nov 30

  Reference

  HW 19/42

• Catalogue level

  Piece

  Signals concerning the handling of German cyphers

  Signals concerning the handling of German cyphers

  Held by

  The National Archives, Kew

  Date

  1942 May 29 - 1942 Oct 10

  Reference

  HW 51/42

• Catalogue level

  Piece

  Soviet Comintern messages: Service 35; Moscow (10) to and from China (mostly 12)....

  Soviet Comintern messages: Service 35; Moscow (10) to and from China (mostly 12). Chinese message serial numbers appear to rise to 100 and re-start at 1 (see 9 July 1943). Clearly many messages are missing.

  Held by

  The National Archives, Kew

  Date

  1943 May 21-1947 Mar 17

  Reference

  HW 17/42