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'C', Chief of the Secret Intelligence Service (SIS): miscellaneous correspondence on cypher matters

4 Apr 1943

A file of miscellaneous correspondence relating to codes and cyphers. Subjects discussed in this file include the disposal of enemy cypher machines after the end of the war; discussion over whether to allow the Soviets to send observers to study British cryptography methods; a proposal to feed the Germans false intelligence via Greek diplomatic cyphers that were known to be weak; surveillance of a diplomat transporting cypher equipment to the German embassy in Dublin; proposals to cover ‘Boniface’ intercepts from detection by capturing and interrogating German officers; and a reported Italian breach of American diplomatic cyphers.
turkey united kingdom technology belgium brazil egypt portugal greece russia information sharing international relations interrogation ireland italy yugoslavia second world war deception signals intelligence security service secret intelligence service secrecy chiefs of staff foreign office intelligence organization alexander cadogan peter loxley diplomatic signals patrick reilly permanent under-secretary's department code-breaking cyphers sicherheitsdienst portuguese east africa armistice anglo-soviet relations archibald clark kerr false intelligence military observers
Collection ID
FO1093
Conflict
Second World War
Countries
Belgium Brazil Egypt Greece Ireland Italy Portugal Portuguese East Africa Russia Turkey United Kingdom Yugoslavia
Document Reference
FO 1093/326/2
Document Types
Memorandum Correspondence
File Reference
FO 1093/326
Identifier
10.1080/swwf.fo1093.0326.002
Keywords
Cyphers Technology Armistice Anglo-soviet Relations Military Observers Information Sharing Deception False Intelligence Secrecy Interrogation Diplomatic Signals
Languages
English
Organizations
Chiefs of Staff Foreign Office Security Service Sicherheitsdienst Permanent Under-Secretary's Department Secret Intelligence Service
Pages
51
Persons Discussed
Alexander Cadogan Archibald Clark Kerr Peter Loxley Patrick Reilly
Published in
United Kingdom
Themes
Signals Intelligence Code-breaking Intelligence Organization International Relations

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