1
Vera L Barnes, Thomas J Dodds Jr, Harold F Gibson, Carl M Campbell Jr: Link encryption device. Burroughs Corporation, Mark T Starr, Edmund M Chung, Kevin R Peterson, July 3, 1979: US04160120 (142 worldwide citation)

An apparatus for insertion in a communications line for providing both message integrity and message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications line, enciphers them on a bit-by-bit basis an ...


2
Vera L Barnes, Thomas J Dodds Jr, Harold F Gibson, Carl M Campbell Jr: Byte stream selective encryption/decryption device. Burroughs Corporation, Mark T Starr, October 23, 1979: US04172213 (132 worldwide citation)

An apparatus for insertion in a communications line for providing message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications line, enciphers them and retransmits them onto the communications line. ...


3
Vera L Barnes, Thomas J Dodds Jr, Harold F Gibson, Carl M Campbell Jr: Communications line authentication device. Burroughs Corporation, Mark T Starr, June 26, 1979: US04159468 (125 worldwide citation)

A device for insertion in a communications line for verifying message integrity within a significant portion of existing communications networks. At the transmitter end, the device receives plain text messages from the communications line, generates an authentication field by encrypting the plain te ...