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• Catalogue level

  Piece

  Commercial reports

  Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Apr 09-1940 Apr 16

  Reference

  HW 29/25

• Catalogue level

  Piece

  Decrypts of Comintern messages: Moscow, USSR, with Amsterdam, Holland. (Described...

  Decrypts of Comintern messages: Moscow, USSR, with Amsterdam, Holland. (Described at item level)

  Held by

  The National Archives, Kew

  Date

  1935 Aug-1936 July

  Reference

  HW 17/25

• Catalogue level

  Piece

  Spanish police messages

  Spanish police messages

  Held by

  The National Archives, Kew

  Date

  1944 Jun 27-1945 Mar 04

  Reference

  HW 22/25

• 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 Mar 19-1944 Mar 23

  Reference

  HW 35/25

• Catalogue level

  Piece

  Commercial messages passed over diplomatic channels

  Commercial messages passed over diplomatic channels

  Held by

  The National Archives, Kew

  Date

  1944 Mar 01-1944 Mar 31

  Reference

  HW 32/25

• Catalogue level

  Piece

  Account of the methods used for breaking German teleprinter cypher messages

  Account of the methods used for breaking German teleprinter cypher messages

  Held by

  The National Archives, Kew

  Date

  1941 Jun 01-1945 Jun 30

  Reference

  HW 25/5

• Catalogue level

  Piece

  Early ENIGMA Papers, all undated. Peter TWINN: ENIGMA (General). FOSS' system of...

  Early ENIGMA Papers, all undated. Peter TWINN: ENIGMA (General). FOSS' system of rectangles. Explanation of keys of the ENIGMA Cipher machine (translation from German). Directions for use of keys on the cipher machine ENIGMA I (translation from Germa…

  Held by

  The National Archives, Kew

  Date

  1933 Jan 01-1943 Dec 31

  Reference

  HW 25/9

• Catalogue level

  Piece

  Operating instructions for the Glow Lamp Ciphering Machine 'ENIGMA'. This document...

  Operating instructions for the Glow Lamp Ciphering Machine 'ENIGMA'. This document is undated but is thought to have been produced in the mid-1920s

  Held by

  The National Archives, Kew

  Date

  1923 Jan 01-1927 Dec 31

  Reference

  HW 25/7

• Catalogue level

  Piece

  Miscellaneous papers in folder entitled 'German Naval ENIGMA'

  Miscellaneous papers in folder entitled 'German Naval ENIGMA'

  Held by

  The National Archives, Kew

  Date

  1939 Aug 26-1957 Dec 30

  Reference

  HW 25/11

• Catalogue level

  Piece

  Cryptographic history of work on German Naval ENIGMA by C H O'D Alexander, Imperial...

  Cryptographic history of work on German Naval ENIGMA by C H O'D Alexander, Imperial Defence College

  Held by

  The National Archives, Kew

  Date

  1920 Jan 01-1945 Dec 31

  Reference

  HW 25/1

• Catalogue level

  Piece

  ENIGMA CHIFFRIERMASCHINEN - HANDELSMASCHINE: this is a pamphlet on the use of ENIGMA,...

  ENIGMA CHIFFRIERMASCHINEN - HANDELSMASCHINE: this is a pamphlet on the use of ENIGMA, the 'large machine', particulaly for business purposes. A translation prepared by the US Armed Forces Security Agency in 1950 is also provided

  Held by

  The National Archives, Kew

  Date

  1923 Jan 01-1950 Dec 31

  Reference

  HW 25/8

• Catalogue level

  Piece

  Photostats of German ENIGMA handbooks. Stabsschluesselungsverfahren, Berlin 1928....

  Photostats of German ENIGMA handbooks. Stabsschluesselungsverfahren, Berlin 1928. Gebrauchsanleitung fuer die Chiffriermaschine ENIGMA vom 12.1.1939. Schluesselanleitung zur Schluesselmaschine ENIGMA vom 13.1.40. Schluesselanleitung zur Schluesselmas…

  Held by

  The National Archives, Kew

  Date

  1928 Jan 01-1940 Jan 13

  Reference

  HW 25/13

• Catalogue level

  Piece

  Selected articles from internal publication; responsibilities and job activities...

  Selected articles from internal publication; responsibilities and job activities of the Duty Signal Officer; extracts from letters received by Director GCHQ soon after the end of the Falklands Crisis

  Held by

  The National Archives, Kew

  Date

  1982 Jan 1 - 1982 Dec 31

  Reference

  HW 92/25

• Catalogue level

  Piece

  Czech State Security miscellaneous messages

  Czech State Security miscellaneous messages

  Held by

  The National Archives, Kew

  Date

  1950 Oct 23 - 1950 Dec 12

  Reference

  HW 75/25

• Catalogue level

  Piece

  Reports of Japanese naval air decrypts

  Reports of Japanese naval air decrypts

  Held by

  The National Archives, Kew

  Date

  1944 Aug 30-1945 Feb 18

  Reference

  HW 27/25

• Catalogue level

  Piece

  The COLOSSUS by B Randell, published in June 1976: an attempt to document the story...

  The COLOSSUS by B Randell, published in June 1976: an attempt to document the story of the development of COLOSSUS and the people involved

  Held by

  The National Archives, Kew

  Date

  1941 Feb 01 - 1945 Dec 31

  Reference

  HW 25/23

• Catalogue level

  Piece

  Reports of Japanese army air decrypts

  Reports of Japanese army air decrypts

  Held by

  The National Archives, Kew

  Date

  1944 Feb 27-1944 Aug 24

  Reference

  HW 28/25

• Catalogue level

  Piece

  A paper on the use of Hollerith equipment in Bletchley Park by Ronald WHELAN MBE,...

  A paper on the use of Hollerith equipment in Bletchley Park by Ronald WHELAN MBE, written some 50 years after the end of the war

  Held by

  The National Archives, Kew

  Date

  1940 May 01-1945 May 31

  Reference

  HW 25/22

• Catalogue level

  Piece

  Miscellaneous correspondence Miscellaneous correspondence 1. Interception trial involving...

  Miscellaneous correspondence Miscellaneous correspondence 1. Interception trial involving HMS YARMOUTH in 1927. 2. Interception trial involving HMS CONCORD in 1929. 3. French wireless communications in 1930. 4. 1931 Russian orbats. 5. World War …

  Held by

  The National Archives, Kew

  Date

  1927 May 19-1945 Dec 31

  Reference

  HW 2/25

• Catalogue level

  Piece

  ENIGMA history. Papers relating to the pre-war meetings between French and Polish...

  ENIGMA history. Papers relating to the pre-war meetings between French and Polish cryptanalysts and members of GC & CS on the subject of ENIGMA; subsequent wartime correspondence between KNOX and DENNISTON on ENIGMA processing at Bletchley Park

  Held by

  The National Archives, Kew

  Date

  1938 Sept 09-1943 June 05

  Reference

  HW 25/12