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  Piece

  Reports revealing enemy knowledge of US Army Air Force communications data in the...

  Reports revealing enemy knowledge of US Army Air Force communications data in the Far East

  Held by

  The National Archives, Kew

  Date

  1943 Apr 08 - 1945 Jul 25

  Reference

  HW 40/121

• Catalogue level

  Piece

  Enemy exploitation of communications related to Macao

  Enemy exploitation of communications related to Macao

  Held by

  The National Archives, Kew

  Date

  1945 Apr 21 - 1945 Jul 21

  Reference

  HW 40/84

• Catalogue level

  Piece

  Reports revealing enemy knowledge of US Army communications data on the Western Front,...

  Reports revealing enemy knowledge of US Army communications data on the Western Front, with some related correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Aug 29 - 1945 Mar 24

  Reference

  HW 40/100

• Catalogue level

  Piece

  Polish: evidence that the OKW (High Command of the German Armed Forces) was reading...

  Polish: evidence that the OKW (High Command of the German Armed Forces) was reading traffic passing between London and the Polish underground

  Held by

  The National Archives, Kew

  Date

  1944 Aug 20 - 1944 Sep 20

  Reference

  HW 40/244

• Catalogue level

  Piece

  Reflections of Japanese deception measures

  Reflections of Japanese deception measures

  Held by

  The National Archives, Kew

  Date

  1944 Sep 26 - 1945 Mar 11

  Reference

  HW 40/209

• Catalogue level

  Piece

  Exploitation of Russian Military communications

  Exploitation of Russian Military communications

  Held by

  Creating government department or its successor

  Date

  1946 Apr 01 - 1949 Jun 24

  Reference

  HW 40/27

• Catalogue level

  Piece

  Allied Signal and Cypher Security: Allied Forces Headquarters (AFHQ) papers on security...

  Allied Signal and Cypher Security: Allied Forces Headquarters (AFHQ) papers on security of Allied communications

  Held by

  The National Archives, Kew

  Date

  1942 Dec 09 - 1944 Apr 30

  Reference

  HW 40/254

• Catalogue level

  Piece

  Reports revealing enemy knowledge of US Army Air Force communications data, with...

  Reports revealing enemy knowledge of US Army Air Force communications data, with some related correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Dec 21 - 1944 Dec 04

  Reference

  HW 40/113

• Catalogue level

  Piece

  Reports revealing enemy knowledge of US Army Air Force communications data on the...

  Reports revealing enemy knowledge of US Army Air Force communications data on the Western Front, with some related correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Jun 09 - 1945 May 03

  Reference

  HW 40/118

• Catalogue level

  Piece

  Reports revealing enemy exploitation of US Army Air Force low grade communications,...

  Reports revealing enemy exploitation of US Army Air Force low grade communications, with some related correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Nov 27 - 1945 Apr 01

  Reference

  HW 40/110

• Catalogue level

  Piece

  Poland: reports and correspondence relating to the security of Polish communications

  Poland: reports and correspondence relating to the security of Polish communications

  Held by

  The National Archives, Kew

  Date

  1945 Sep 22 - 1950 Aug 26

  Reference

  HW 40/222

• Catalogue level

  Piece

  Enemy exploitation of British Army low grade codes and cyphers: miscellaneous reports...

  Enemy exploitation of British Army low grade codes and cyphers: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1943 Sep 26 - 1943 Nov 30

  Reference

  HW 40/46

• Catalogue level

  Piece

  Enemy exploitation of British Army WTI (wireless telegraphy intelligence). Missing...

  Enemy exploitation of British Army WTI (wireless telegraphy intelligence). Missing at transfer

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1945 Dec 31

  Reference

  HW 40/51

• Catalogue level

  Piece

  Enemy exploitation of British Army low grade codes and cyphers: miscellaneous reports...

  Enemy exploitation of British Army low grade codes and cyphers: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1941 Nov 25 - 1943 Sep 30

  Reference

  HW 40/45

• Catalogue level

  Piece

  DGs and Callsigns. Missing at transfer

  DGs and Callsigns. Missing at transfer

  Held by

  The National Archives, Kew

  Date

  1943 Jan 01 - 1945 Dec 31

  Reference

  HW 40/65

• Catalogue level

  Piece

  Decrypts relating to enemy exploitation of US State Department cyphers, with related...

  Decrypts relating to enemy exploitation of US State Department cyphers, with related correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Aug 18 - 1945 Oct 24

  Reference

  HW 40/132

• Catalogue level

  Piece

  Extracts from reports revealing enemy exploitation of American cyphers from miscellaneous...

  Extracts from reports revealing enemy exploitation of American cyphers from miscellaneous sources

  Held by

  The National Archives, Kew

  Date

  1942 Dec 08 - 1943 Dec 03

  Reference

  HW 40/96

• Catalogue level

  Piece

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

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

  Held by

  The National Archives, Kew

  Date

  1942 Oct 29 - 1945 Mar 06

  Reference

  HW 40/63

• Catalogue level

  Piece

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

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

  Held by

  The National Archives, Kew

  Date

  1942 Jan 29 - 1945 Mar 21

  Reference

  HW 40/43

• Catalogue level

  Piece

  German Y operations in Spain, performed by KO (Kriegsorganisation), Spain

  German Y operations in Spain, performed by KO (Kriegsorganisation), Spain

  Held by

  The National Archives, Kew

  Date

  1930 Jan 01 - 1948 Jun 02

  Reference

  HW 40/192