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
Carl M Campbell Jr: Key management system for on-line communication. VISA U, Limbach Limbach & Sutton, August 12, 1986: US04605820 (134 worldwide citation)

The subject invention relates to a new and improved key management system particularly suited to facilitate communication between point of sale terminals and a host processor. The system provides for the generation of a table of keys in the terminal. The terminal includes a counter which is related ...


3
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. ...


4
Elvis W Boggan, Carl M Campbell Jr: Transaction approval system. Visa International Service Association, Limbach Limbach & Sutton, April 18, 1989: US04822985 (125 worldwide citation)

An improved system is disclosed for detecting invalid transaction cards at remote transaction terminals. The system includes providing each terminal with a master table having data corresponding to invalid cards. The data in the master table is less than the actual account numbers of the invalid car ...


5
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 (122 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 ...


6
Carl M Campbell Jr: Account file for off-line transaction authorization. Visa International Service Association, Heller Ehrman White & McAuliffe, March 7, 1995: US05396624 (47 worldwide citation)

An approach for handling data representative of invalid transaction cards is disclosed. A memory area 34 in a transaction terminal 16 is divided into a plurality of stacks. Two digits of the invalid account number are used to identify the stack into which the remainder of the account number is added ...


7
Carl M Campbell Jr: Key variable generator for an encryption/decryption device. Burroughs Corporation, Mark T Starr, Kevin R Peterson, Edmund M Chung, January 18, 1983: US04369332 (35 worldwide citation)

An apparatus and method for generating a unique working key variable for controlling the operation of an encryption/decryption device during each user specified time period. The apparatus generates each working key variable by encrypting a user specified value, unique for each specified time period, ...


8
Carl M Campbell Jr: Authenticator code generator. Burroughs Corporation, Mark T Starr, December 8, 1981: US04304961 (20 worldwide citation)

A device for generating an authenticator code by encrypting the contents of a plain text message in accordance with a unique user supplied authenticator key variable. The device operates in two phases, the first of which processes every character in the plain text message and produces a first sequen ...


9
Carl M Campbell Jr: Authenticator device for precluding compensating text modifications in transmitted messages. Burroughs Corporation, Mark T Starr, February 2, 1982: US04314097 (15 worldwide citation)

An authenticator device designed to preclude undetected compensating text modifications in a message by sequentially processing each character of the message and producing an authenticator code as a result of said processing.



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