Eric Walker added The Secret History of the Vocoder - YouTube to SIGSALY
Eric Walker added SIGSALY - Wikipedia to SIGSALY
Eric Walker added a number of links to SIGSALY, and added SIGSALY to Cryptography and encryption and Telecommunications
Eric Walker added Quantum cryptography and SIGSALY and a number of links to Cryptography and encryption, and added Cryptography and encryption to Privacy, computer security, vulnerabilities and attacks
Eric Walker added a number of topics and a number of links to Telecommunications, and added Telecommunications to Technology