Document Title Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
Reference HW 1/2342
Conflicts Second World War
Themes Military Intelligence and Operations, Intelligence Organisation and Administration, Signals Intelligence and Code-breaking
Regions Europe, Middle East
Countries Germany, Turkey, West Germany
Document Type Signals Intelligence
Organisations Chiefs of Staff, Government Code and Cypher School, Joint Intelligence Sub-Committee, Security Service
People Alan Brooke, Andrew Cunningham


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 contains a minute from C to the Assistant Chief of Air Staff Intelligence (ACASI) pointing out the Prime Minister's (PM's) comment to paragraph 4 of a report from the Japanese ambassador in Berlin (see 5359 for the ACASI's reply to the PM); from the Japanese ambassador in Berlin, forwarding information from German sources on abortive U.S. large-scale daylight air raids against Magdeburg and Dessau on January 11, the position on the Russian Front, Turkey's neutrality and the fact that the daily Allied air raids against the Pas de Calais area were obviously targeted against 'reprisal' V-1 installations although these had not been damaged any more than the submarine pens there; and a paper dated January 20, a copy for the PM, from the War Cabinet Chiefs of Staff Committee, proposing the establishment of a new Comsec authority at the Government Code and Cypher School (CSS) to counter the potential exploitation of British communications and cyphers.


diplomatic intelligence, air warfare, casualties, aircraft, information sharing, Axis powers, cyphers, codes, British intelligence organisation, security

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