Admiralty: Naval Intelligence Division and Government Code and Cypher School: Wireless News

ADM 233
Admiralty: Naval Intelligence Division and Government Code and Cypher School: Wireless News

Summaries of wireless signals from stations in central Europe and elsewhere intercepted and circulated to interested departments by the Naval Intelligence Division, later by the Government Code and Cypher School.

Related Material:
For earlier copies of Wireless News see: ADM 137
Records of the Government Code and Cypher School: HW
Held by:
The National Archives, Kew
Legal status:
Public Record
Admiralty, Government Code and Cypher School, 1919-1922
Physical description:
35 file(s)
Administrative / biographical background:

In 1914 Sir Alfred Ewing, Director of Naval Education, established an organisation to decrypt enemy naval wireless signals. Known as 'Room 40', responsibility for the organisation was transferred to the Naval Intelligence should be Department of the Naval War Staff in May 1917. A Government Code and Cypher School (GC&CS) was established in November 1919, merging 'Room 40' and MI 1(c) under the Director of Naval Intelligence Commodore Hugh Sinclair. Formal responsibility for the School was passed to the Foreign Office on 1 April 1922.

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