Cryptographic signaling applied to radio communication circuits

This paper considers the application of pre-programming to repetitious messages. After being programmed, transmission is by single-pulsed tone. The system provides more effective utilization of frequency, a high degree of security for message context, and a subscriber service much superior to that available in most present day systems. After evaluation of the system described, consideration is given to the extension of these techniques to permit a high speed, high capacity, message service simultaneously with other services on a common channel.