A file of correspondence and memoranda concerning the secrecy and circulation of signals intelligence during the Second World War. Subjects discussed in this file include the changing of Japanese cyphers; German intelligence sources in the Chilean army; the security of allied cyphers; the exchange of ‘Ultra’ decryptions with the Americans; security and censorship arrangements for Operation Overlord, including information leaks to American newspapers and a Brazilian diplomat; a debate over the circulation of classified signals intelligence within the British intelligence services; and an intercepted message from the German embassy in Lisbon to Berlin reporting a recent speech by Winston Churchill, and drawing conclusions about Anglo-Soviet relations.
- Collection ID
- FO1093
- Conflict
- Second World War
- Countries
- Albania Australia Azores Brazil Canada England France Great Britain Hungary India Iraq Philippines Portugal Romania Soviet Union Turkey United States of America Yugoslavia
- Document Reference
- FO 1093/329/2
- Document Types
- Intelligence Report Correspondence Memorandum
- File Reference
- FO 1093/329
- Identifier
- 10.1080/swwf.fo1093.0329.002
- Keywords
- Diplomatic Signals Anglo-soviet Relations Cyphers Intelligence Gathering Diplomatic Officials Informants Information Sharing Anglo-american Relations Leakage Of Information Censorship Operation Overlord Press Reports Security Clearance Classified Documents Intelligence Distribution Secrecy
- Languages
- English
- Organizations
- Chiefs of Staff Foreign Office Joint Staff Mission Security Service Permanent Under-Secretary's Department Secret Intelligence Service
- Pages
- 82
- Persons Discussed
- Edward Bridges Thomas Bromley Alexander Cadogan Alastair Denniston Peter Loxley David Petrie
- Published in
- United Kingdom
- Themes
- Signals Intelligence Code-breaking Propaganda Censorship Psychological Warfare
