A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following correspondence: a request from C to the Prime Minister (PM) requesting permission to reveal to the Americans British progress with German armed forces cryptography, and a record of the information passed to them.
- Collection ID
- HW1
- Conflict
- Second World War
- Document Reference
- HW1 /2/2
- Document Types
- Intelligence Report
- File Reference
- HW1 /2
- Identifier
- 10.1080/swwf.hw1.0002.002
- Keywords
- Cyphers Communications Interception Information Sharing Anglo-american Relations
- Languages
- English
- Organizations
- Chiefs of Staff Government Code and Cypher School
- Pages
- 3
- Published in
- United Kingdom
- Themes
- Signals Intelligence Code-breaking Intelligence Organization International Relations
