Cipher Printing Telegraph Systems For Secret Wire and Radio Telegraphic Communications

TLDR

This paper describes a printing telegraph cipher system developed during World War II for the U.S. Army Signal Corps. The system keeps messages in secret form from transmission until automatic deciphering at the addressee, and its operation and use for wire, mail, or radio transmission are described.

Abstract

This paper describes a printing telegraph cipher system devetoped during the World War for the use of the Signal Corps, U. S. Army. This system is so designed that the messages are in secret form from the time they leave the sender until they are deciphered automatically at the office of the addressee. If copied while en route, the messages cannot be deciphered by an enemy, even though he has full knowledge of the methods and apparatus used. The operation of the equipment is described, as well as the method of using it for sending messages by wire, mail or radio. The paper also discusses the practical impossibility of preventing the copying of messages, as by wire tapping, and thte relative advantages of various codes and ciphers as regards speed, accutracy and the secrecy of their messages.