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  Soviet Comintern messages: ISCOT 1401-1491. ISCOT numbers 1427-1436 were not used...

  Soviet Comintern messages: ISCOT 1401-1491. ISCOT numbers 1427-1436 were not used owing to a typing error.

  Held by

  The National Archives, Kew

  Date

  1945 Aug 28-1947 Apr 14

  Reference

  HW 17/67

• Catalogue level

  Piece

  Decrypts of medium/low grade German naval cypher messages

  Decrypts of medium/low grade German naval cypher messages

  Held by

  The National Archives, Kew

  Date

  1942 May 21-1942 Jul 10

  Reference

  HW 18/67

• Catalogue level

  Piece

  Italian air activity including daily summaries 297 - 354.

  Italian air activity including daily summaries 297 - 354.

  Held by

  The National Archives, Kew

  Date

  1942 July 15-1942 Sept 10

  Reference

  HW 21/67

• 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 Nov 19-1944 Nov 24

  Reference

  HW 35/67

• 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

  1945 Jun 20-1945 Aug 05

  Reference

  HW 52/67

• Catalogue level

  Piece

  76766-79063

  76766-79063

  Held by

  The National Archives, Kew

  Date

  1944 Mar 17-1944 May 05

  Reference

  HW 19/67

• Catalogue level

  Piece

  Specimen summaries of information derived from GAF fighter traffic deemed to be of...

  Specimen summaries of information derived from GAF fighter traffic deemed to be of value to Allied Bomber Command

  Held by

  The National Archives, Kew

  Date

  1943 Nov 9-1944 Feb 5

  Reference

  HW 13/67

• Catalogue level

  Piece

  Reports and signals on Japanese service communications, particularly naval, including...

  Reports and signals on Japanese service communications, particularly naval, including quarterly reports produced by the Hong Kong Cryptographic Bureau

  Held by

  The National Archives, Kew

  Date

  1928 Apr 30 - 1939 Aug 31

  Reference

  HW 67/1

• Catalogue level

  Piece

  ISL from C: PM's query on Naval Headlines 76 and on signal from Italian minister,...

  ISL from C: PM's query on Naval Headlines 76 and on signal from Italian minister, Sofia on possible British demands on Turkey

  Held by

  The National Archives, Kew

  Date

  1941 Sept 15

  Reference

  HW 1/67

• Catalogue level

  Piece

  Naval Section War Records, Watch notes Nos. 1-110

  Naval Section War Records, Watch notes Nos. 1-110

  Held by

  The National Archives, Kew

  Date

  1941 Jul 20-1942 Oct 01

  Reference

  HW 8/67

• Catalogue level

  Piece

  Signal intelligence effort against Japan

  Signal intelligence effort against Japan

  Held by

  The National Archives, Kew

  Date

  1944 Sep 02 - 1944 Sep 11

  Reference

  HW 67/16

• Catalogue level

  Piece

  Japanese communcations: messages and reports concerned with intercept, analysis and...

  Japanese communcations: messages and reports concerned with intercept, analysis and code breaking

  Held by

  The National Archives, Kew

  Date

  1944 Apr 01 - 1945 Jul 31

  Reference

  HW 67/12

• Catalogue level

  Piece

  SIXTA History, copy of appendices to the central paper. Charts detailing the progress...

  SIXTA History, copy of appendices to the central paper. Charts detailing the progress of WTI (analysis of enemy communications structure an d activity) against the German Air Force and Army

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 May 06

  Reference

  HW 50/67

• Catalogue level

  Piece

  Security of signals intelligence against Japanese communications

  Security of signals intelligence against Japanese communications

  Held by

  The National Archives, Kew

  Date

  1944 Nov 06 - 1945 Aug 30

  Reference

  HW 67/14

• Catalogue level

  Piece

  Japanese communcations: messages and reports concerned with intercept, analysis and...

  Japanese communcations: messages and reports concerned with intercept, analysis and code breaking

  Held by

  The National Archives, Kew

  Date

  1942 Jan 01 - 1942 Jun 30

  Reference

  HW 67/3

• Catalogue level

  Piece

  Ultra/ZIP/RAF/JAP Reports Nos 1-260: RAF Section progress on decoding Japanese Army/Air...

  Ultra/ZIP/RAF/JAP Reports Nos 1-260: RAF Section progress on decoding Japanese Army/Air three and four figure traffic

  Held by

  The National Archives, Kew

  Date

  1944 Jan 10 - 1945 Jun 21

  Reference

  HW 67/18

• Catalogue level

  Piece

  Enemy exploitation of Naval WTI (wireless telegraphy intelligence): miscellaneous...

  Enemy exploitation of Naval WTI (wireless telegraphy intelligence): miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1943 Jun 30 - 1945 Apr 01

  Reference

  HW 40/67

• Catalogue level

  Piece

  Ten-page document by EWT on developments at BP during his first 12 months as DD (S),...

  Ten-page document by EWT on developments at BP during his first 12 months as DD (S), Feb 18; EWT to C with comments on DMI's letter of Jan 29 to Chairman Y Board on future of UK Sigint; EWT to Heads of Sections Feb 14 requesting brief weekly summarie…

  Held by

  The National Archives, Kew

  Date

  1943 Feb 11-20

  Reference

  HW 14/67

• Catalogue level

  Piece

  Reports produced by RAF 276 Wing located at Cairo, Egypt

  Reports produced by RAF 276 Wing located at Cairo, Egypt

  Held by

  The National Archives, Kew

  Date

  1943 Feb 17 - 1943 Mar 27

  Reference

  HW 51/67

• Catalogue level

  Piece

  Reports of Japanese army air decrypts with subject headers

  Reports of Japanese army air decrypts with subject headers

  Held by

  The National Archives, Kew

  Date

  1944 Oct 02-1945 May 30

  Reference

  HW 28/67