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  Piece

  Enemy exploitation of Naval medium grade codes and cyphers: miscellaneous reports...

  Enemy exploitation of Naval medium grade codes and cyphers: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Jul 22 - 1944 Apr 11

  Reference

  HW 40/62

• Catalogue level

  Piece

  Exploitation of Russian meteorological communications by Axis Powers

  Exploitation of Russian meteorological communications by Axis Powers

  Held by

  The National Archives, Kew

  Date

  1944 May 05 - 1945 Feb 02

  Reference

  HW 40/31

• Catalogue level

  Piece

  Enemy exploitation of codes and cyphers of various UK Government Departments: miscellaneous...

  Enemy exploitation of codes and cyphers of various UK Government Departments: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1943 Oct 27 - 1945 Feb 15

  Reference

  HW 40/77

• Catalogue level

  Piece

  Enemy exploitation of RAF low grade codes and cyphers in the Far East: miscellaneous...

  Enemy exploitation of RAF low grade codes and cyphers in the Far East: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Feb 25 - 1945 Sep 05

  Reference

  HW 40/56

• Catalogue level

  Piece

  Enemy exploitation of Naval high grade codes and cyphers: miscellaneous reports and...

  Enemy exploitation of Naval high grade codes and cyphers: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Aug 11 - 1943 Mar 25

  Reference

  HW 40/60

• Catalogue level

  Piece

  Reports and correspondence relating to enemy exploitation of communications associated...

  Reports and correspondence relating to enemy exploitation of communications associated with Russian convoys

  Held by

  The National Archives, Kew

  Date

  1944 Dec 05 - 1945 Mar 27

  Reference

  HW 40/38

• Catalogue level

  Piece

  Security of Dutch communications

  Security of Dutch communications

  Held by

  The National Archives, Kew

  Date

  1945 Feb 21 - 1945 Apr 23

  Reference

  HW 40/251

• Catalogue level

  Piece

  Minutes of meetings of Wireless Telegraphy (W/T) Security Committee for 28 October...

  Minutes of meetings of Wireless Telegraphy (W/T) Security Committee for 28 October 1941 to 17 July 1946, with associated papers; and letter of 15 January 1979 from Communications/Electronics Security Group to Professor Michael Howard of the Cabinet O…

  Held by

  The National Archives, Kew

  Date

  1941 Oct 28 - 1979 Jan 15

  Reference

  HW 40/274

• Catalogue level

  Piece

  Notes and correspondence concerning liaison visit made by Cmdr. Barham (British Eastern...

  Notes and correspondence concerning liaison visit made by Cmdr. Barham (British Eastern Fleet] to FRUPAC and Washington June-August 1944.

  Held by

  The National Archives, Kew

  Date

  1944 Feb 23-1944 Sep 01

  Reference

  HW 8/40

• Catalogue level

  Piece

  Security of British and Allied communications: periodic reviews

  Security of British and Allied communications: periodic reviews

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01 - 1945 Feb 28

  Reference

  HW 40/8

• Catalogue level

  Piece

  RAF wireless intelligence and R/T activity reports on the German, Italian and French...

  RAF wireless intelligence and R/T activity reports on the German, Italian and French air forces

  Held by

  The National Archives, Kew

  Date

  1942 Apr 01-1943 Apr 30

  Reference

  HW 41/40

• Catalogue level

  Piece

  Reports in the series QT/4501 to QT/5000.

  Reports in the series QT/4501 to QT/5000.

  Held by

  The National Archives

  Date

  1942 Oct 27-1942 Nov 02

  Reference

  HW 20/40

• Catalogue level

  Piece

  Ministry of Works and Buildings activity at Bletchley Park

  Ministry of Works and Buildings activity at Bletchley Park

  Held by

  The National Archives, Kew

  Date

  1942 May 01 - 1942 Aug 31

  Reference

  HW 64/40

• Catalogue level

  Piece

  Report of meeting with head of the Russian Radio Reconnaissance Section of the Russian...

  Report of meeting with head of the Russian Radio Reconnaissance Section of the Russian Naval Staff at Polyarnoe, Russia

  Held by

  The National Archives, Kew

  Date

  1942 Nov 18 - 1942 Dec 03

  Reference

  HW 61/40

• Catalogue level

  Piece

  Security of electronic communications

  Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Feb-1957 June

  Reference

  HW 9/40

• Catalogue level

  Piece

  GC&CS Naval Cryptanalytic Studies Volume XV: Japanese Strip Cyphers by F G W Bowe,...

  GC&CS Naval Cryptanalytic Studies Volume XV: Japanese Strip Cyphers by F G W Bowe, R A Carter and H R Foss

  Held by

  Creating government department or its successor

  Date

  1939 Sep 01 - 1945 Aug 30

  Reference

  HW 43/40

• Catalogue level

  Piece

  Enemy exploitation of RAF WTI (wireless telegraphy intelligence) on the Western Front:...

  Enemy exploitation of RAF WTI (wireless telegraphy intelligence) on the Western Front: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Jun 15 - 1945 Apr 12

  Reference

  HW 40/55

• Catalogue level

  Piece

  Reports revealing enemy exploitation of US Army Air Force communications in the UK

  Reports revealing enemy exploitation of US Army Air Force communications in the UK

  Held by

  The National Archives, Kew

  Date

  1944 May 16 - 1944 May 17

  Reference

  HW 40/115

• Catalogue level

  Piece

  Other Foreign Y Services. Missing at transfer

  Other Foreign Y Services. Missing at transfer

  Held by

  The National Archives, Kew

  Date

  1943 Jan 01 - 1950 Dec 31

  Reference

  HW 40/213

• Catalogue level

  Piece

  Papers (mostly reports) revealing the extent and competence of the German Air Force...

  Papers (mostly reports) revealing the extent and competence of the German Air Force Sigint organisation

  Held by

  The National Archives, Kew

  Date

  1943 Sep 06 - 1944 May 28

  Reference

  HW 40/150