0326

File Title 'C', Chief of the Secret Intelligence Service (SIS): miscellaneous correspondence on cypher matters
Reference FO 1093/326
Date 4 April 1943 - 1 December 1943
Government Department Foreign Office
File Accession Date 23 May 2013

Description

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.

Document Title Date
i Front Cover Download PDF (349 KB)
1st 'C', Chief of the Secret Intelligence Service (SIS): miscellaneous correspondence on cypher matters Download PDF (7.97 MB)
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