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• Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Nov-1955 Aug

  Reference

  HW 9/42

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

  Held by

  The National Archives, Kew

  Date

  1924 Jun 11-1938 Apr 28

  Reference

  HW 42/1

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

  Held by

  The National Archives, Kew

  Date

  1921-1922

  Reference

  HW 3/42

• 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

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

  Held by

  The National Archives, Kew

  Date

  1941 Apr 02-1943 Oct 13

  Reference

  HW 42/22

• Traffic analysis against the French navy

  Held by

  The National Archives, Kew

  Date

  1942 Mar 23-1943 May 24

  Reference

  HW 18/42

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

  Held by

  The National Archives, Kew

  Date

  1935 May 08-1938 Sep 22

  Reference

  HW 42/4

• 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

• 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

• 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

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

  Held by

  The National Archives, Kew

  Date

  1947 Apr 18 - 1947 May 07

  Reference

  HW 75/42

• 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

• 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

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

  Held by

  The National Archives, Kew

  Date

  1945 Jul 01-1945 Aug 17

  Reference

  HW 42/15

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

  Held by

  The National Archives, Kew

  Date

  1944 Jul 07-1944 Dec 22

  Reference

  HW 42/13

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

  Held by

  The National Archives, Kew

  Date

  1943 Oct 29-1945 Oct 02

  Reference

  HW 42/28

• Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1943 Nov 04-1943 Nov 05

  Reference

  HW 23/42

• 44669-46005

  Held by

  The National Archives, Kew

  Date

  1942 Nov 16-1942 Nov 30

  Reference

  HW 19/42

• Signals concerning the handling of German cyphers

  Held by

  The National Archives, Kew

  Date

  1942 May 29 - 1942 Oct 10

  Reference

  HW 51/42

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

  Held by

  The National Archives, Kew

  Date

  1943 May 21-1947 Mar 17

  Reference

  HW 17/42