06 ago
|
Chiffriermaschine
|
México
06 ago
Chiffriermaschine
México
A group of personal and official papers relating to E.J.G. Hoare, an officer serving in the 302 Indian Special Wireless Section in India and elsewhere in the Far East, dating between 1945 and 1947.
The Special Wireless
Section was part of the so-called ‘Y Service’ signals intelligence collection organisation, which listened in to enemy radio transmissions. One document, a message from South East Asian Land Forces (SEALF) to Burma Command calls for Hoare to bring "certain TOPSEC and SECRET equipment and documents" to the headquarters of the SEALF in Singapore. This equipment and documents, another document elaborates, are CCBP OI22-6 and OI22-7 combined authentication systems, Slidex cipher devices and keys, as well as War Office Column sequence charts.
The writing on the back of the message is an exercise in Boolean algebra.
📌 Cipher-related Y Service documents (México)
🏢 Chiffriermaschine
📍 México