CalmView: Record

Level	Item
Finding No	POL/3/6/7/2
Extent	1 item
Title	File relating to cyphers
Date	1915-1939
Description	Includes correspondence from the Home Office relating to the UC Cypher. Also includes a booklet used for decoding and encoding messages, 1919; and instructions for using the Sudan cypher; a list of chief constables willing to use the cypher for espionage and correspondence regarding the problems in sending cyphers.
AccessStatus	Open