Government Code and Cypher School: Cryptographic Studies

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Details of HW 25
Reference: HW 25
Title: Government Code and Cypher School: Cryptographic Studies

At the end of the Second World War histories were written of various aspects of the work of the Bletchley Park organisation. Records in the series include volumes covering the breaking of two of the major cypher systems used by the enemy - ENIGMA and TUNNY, photographs of ENIGMA, TUNNY and COLOSSUS machinery, and papers on the development of COLOSSUS.

Date: 1920-1978
Held by: The National Archives, Kew
Legal status: Public Record(s)
Language: English
Physical description: 38 files and volumes
Access conditions: Open unless otherwise stated
Immediate source of acquisition:

Government Communications Headquarters , from 1999

Selection and destruction information: The entire series has been preserved
Accruals: Series is accruing

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