Abstract

The article discusses the history of development and use of a Polish wireless communications security machine of World War II, which was designed to send telegraphic messages at high speeds in order to avoid interception by Nazi German signals intelligence (SIGINT). It emphasizes the technological issues related to the design of the unit and the development of high speed keyers in agent radio operations. The article also briefly describes the measures related to signals intelligence, which improved the operational security in the Polish Home Army wireless service during the war.

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