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  Piece

  Dossiers on ENIGMA. Historical notes on the cryptographic attack on ENIGMA. Uncle...

  Dossiers on ENIGMA. Historical notes on the cryptographic attack on ENIGMA. Uncle D [Umkehrwalze D] and ENIGMA Uhr; pre-war history of ENIGMA machine; general u-boat key (SHARK) - delays in breaking

  Held by

  The National Archives, Kew

  Date

  1936 Apr 28 - 1945 May 06

  Reference

  HW 50/69

• Catalogue level

  Piece

  Japanese naval decrypts

  Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1944 Jan 09-1944 Jan 10

  Reference

  HW 23/69

• Catalogue level

  Piece

  81283-82002

  81283-82002

  Held by

  The National Archives, Kew

  Date

  1944 Jun 09-1944 Jun 18

  Reference

  HW 19/69

• Catalogue level

  Piece

  Reports on GAF Sea Reconnaissance and offensive operations

  Reports on GAF Sea Reconnaissance and offensive operations

  Held by

  The National Archives, Kew

  Date

  1944 Feb 21-1944 June 4

  Reference

  HW 13/69

• Catalogue level

  Piece

  Sitrep from 2nd Air Corps to 12nd Army HQ, Sept 15 indicates steady advance south...

  Sitrep from 2nd Air Corps to 12nd Army HQ, Sept 15 indicates steady advance south and southeast of Chernigov. 1st Panzer Group made contact with 2nd Panzer Group completing encirclement and 17th Army advancing on Poltava with 4th Air Corps to attack …

  Held by

  The National Archives, Kew

  Date

  1941 Sept 16

  Reference

  HW 1/69

• Catalogue level

  Piece

  Report on the Work of 3G(N) together with a Personal and Confidential minute from...

  Report on the Work of 3G(N) together with a Personal and Confidential minute from 3G(N) [clearly written by Professor Norman, head of this sub-section. The 'N' of the title probably stands for 'Norman']. 3G(N) was a sub-section of 3G of Hut 3, set up…

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 Aug 01

  Reference

  HW 43/69

• Catalogue level

  Piece

  Naval Section War Records, Naval Section Watch Log. The watch maintained 24 hours...

  Naval Section War Records, Naval Section Watch Log. The watch maintained 24 hours duty and was responsible for immediate intelligence reporting to the Admiralty as well as out-of-hours coordination.

  Held by

  The National Archives, Kew

  Date

  1941 Oct 29-1942 Dec 19

  Reference

  HW 8/69

• Catalogue level

  Piece

  Security, Canadian Personnel. 'Y' (Sigint) Board file on problem of security of Canadian...

  Security, Canadian Personnel. 'Y' (Sigint) Board file on problem of security of Canadian personnel with German and Italian connections

  Held by

  The National Archives, Kew

  Date

  1942 Feb 25 - 1943 Apr 26

  Reference

  HW 69/5

• Catalogue level

  Piece

  Personnel - HQ Officers. 'Y' [Sigint] Committee file concerning appointment of suitable...

  Personnel - HQ Officers. 'Y' [Sigint] Committee file concerning appointment of suitable high-ranking personnel

  Held by

  The National Archives, Kew

  Date

  1944 Feb 05 - 1945 May 12

  Reference

  HW 69/3

• Catalogue level

  Piece

  P/YB/113/FF Security ULTRA, Time Lag in Dissemination of ULTRA. P/YB/113/EE Dissemination...

  P/YB/113/FF Security ULTRA, Time Lag in Dissemination of ULTRA. P/YB/113/EE Dissemination of Intelligence, Security Instructions, Security Grading. London Sigint Board correspondence on Sigint security

  Held by

  The National Archives, Kew

  Date

  1944 Feb 08 - 1945 Aug 13

  Reference

  HW 69/11

• Catalogue level

  Piece

  North Africa, Cooperation with OSS [US Office of Strategic Services]. London Sigint...

  North Africa, Cooperation with OSS [US Office of Strategic Services]. London Sigint Board correspondence on role of OSS in North Africa

  Held by

  The National Archives, Kew

  Date

  1943 Aug 26 - 1943 Oct 02

  Reference

  HW 69/17

• Catalogue level

  Piece

  CY/60/K Middle East, Military 'Y' [Sigint] Report for October 1942. CY/60/L Middle...

  CY/60/K Middle East, Military 'Y' [Sigint] Report for October 1942. CY/60/L Middle East, Personnel. CY/60/G Blandy's Report on Inspection of RAF Wireless Intelligence Service in the Middle East. CY/60/H Middle East and Palestine Iraq Command, Coordin…

  Held by

  The National Archives, Kew

  Date

  1940 Aug 28 - 1945 Apr 16

  Reference

  HW 69/16

• Catalogue level

  Piece

  Enemy exploitation of Naval LOXO etc: miscellaneous reports and correspondence

  Enemy exploitation of Naval LOXO etc: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Jul 07 - 1943 Sep 22

  Reference

  HW 40/69

• Catalogue level

  Piece

  YB/113/ZZ Security, Employment of Aliens on 'Y' [Sigint]. YB/113/S Security, Employment...

  YB/113/ZZ Security, Employment of Aliens on 'Y' [Sigint]. YB/113/S Security, Employment of Alien Special Intelligence Officers at Suez Road. YB/113/Q Security Belgians - ME [Middle East]. YB/113/R Security, Polish. YB/113/V Security, Cooperation Ital…

  Held by

  The National Archives, Kew

  Date

  1942 Sep 13 - 1944 Aug 25

  Reference

  HW 69/14

• Catalogue level

  Piece

  Deployment of staff involved in signals intelligence in the Far East and GC&CS Contains...

  Deployment of staff involved in signals intelligence in the Far East and GC&CS Contains details of Citadel X, an underground building being considered to house staff

  Held by

  The National Archives, Kew

  Date

  1944 Jun 22 - 1944 Sep 29

  Reference

  HW 64/69

• Catalogue level

  Piece

  CBME [Combined Bureau Middle East] General. Correspondence and minutes of senior...

  CBME [Combined Bureau Middle East] General. Correspondence and minutes of senior intelligence authorities in London, including the 'Y' [Sigint] Committee and London Sigint Intelligence Board, from plans for a Middle East Bureau until its abolition on…

  Held by

  The National Archives, Kew

  Date

  1940 Aug 29 - 1944 Mar 13

  Reference

  HW 69/2

• Catalogue level

  Piece

  Security Grading and Classification of Categories ('Top Secret' etc); Security Grading...

  Security Grading and Classification of Categories ('Top Secret' etc); Security Grading of Documents, etc (NIB [Noise Investigation Bureau] etc). 'Y' [Sigint] Board files containing correspondence on classification of documents

  Held by

  The National Archives, Kew

  Date

  1944 Mar 14 - 1945 Jun 05

  Reference

  HW 69/8

• Catalogue level

  Piece

  Security - Middle East, Miscellaneous; and Security - Balkans, Greece. 'Y' [Sigint]...

  Security - Middle East, Miscellaneous; and Security - Balkans, Greece. 'Y' [Sigint] Board files on security of Greek Government communications and communications security in the Middle East

  Held by

  The National Archives, Kew

  Date

  1942 Jun 04 - 1944 Sep 22

  Reference

  HW 69/6

• Catalogue level

  Piece

  Security - Meteorological Decodes, Dissemination of. London Sigint Board correspondence...

  Security - Meteorological Decodes, Dissemination of. London Sigint Board correspondence concerning secure dissemination of decodes of enemy meteorological messages

  Held by

  The National Archives, Kew

  Date

  1944 Apr 20 - 1945 May 23

  Reference

  HW 69/13

• Catalogue level

  Piece

  Charter for Director CBME [Combined Bureau Middle East]. Correspondence between 'Y'...

  Charter for Director CBME [Combined Bureau Middle East]. Correspondence between 'Y' [Sigint] Board members and with 'Y' ME Board concerning terms of reference and title of Director CBME

  Held by

  The National Archives, Kew

  Date

  1942 Jun 13 - 1942 Sep 10

  Reference

  HW 69/1