Focus on
Olga Gray and the Woolwich Arsenal Spy Ring
In 1938, thanks to years of work by a remarkable female agent, MI5 ensured a package of British defence plans stayed secret.
Piece
Dossiers on ENIGMA. Historical notes on the cryptographic attack on ENIGMA. Uncle...
Catalogue reference: HW 50/69
What’s it about?
This record is about the Dossiers on ENIGMA. Historical notes on the cryptographic attack on ENIGMA. Uncle... dating from 1936 Apr 28 - 1945 May 06 in the series Government Code and Cypher School and Government Communications Headquarters: Records.... It is held at The National Archives, Kew.
Is it available online?
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Full description and record details
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Reference (The unique identifier to the record described, used to order and refer to it)
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HW 50/69
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Date (When the record was created)
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1936 Apr 28 - 1945 May 06
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Description (What the record is about)
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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
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Held by (Who holds the record)
- The National Archives, Kew
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Legal status (A note as to whether the record being described is a Public Record or not)
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Public Record(s)
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Access conditions (Information on conditions that restrict or affect access to the record)
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Retained Until 2004
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Closure status (Whether the record is ‘open’ (available to the public) or ‘closed’ (not available due to a legal exemption))
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Open Document, Open Description
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Subjects (Categories and themes found in our collection (our subject list is under development, and some records may have no subjects or fewer than expected))
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Record URL
- https://beta.nationalarchives.gov.uk/catalogue/id/C11205626/
How to order it
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Series information
HW 50
Government Code and Cypher School and Government Communications Headquarters: Records...
See the series level description for more information about this record.
Catalogue hierarchy
Over 27 million records
This record is held at The National Archives, Kew
17,110 records
Within the department: HW
Records created or inherited by Government Communications Headquarters (GCHQ)
149 records
Within the series: HW 50
Government Code and Cypher School and Government Communications Headquarters: Records...
You are currently looking at the piece: HW 50/69
Dossiers on ENIGMA. Historical notes on the cryptographic attack on ENIGMA. Uncle...
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