1
William F Ehrsam, Robert C Elander, Stephen M Matyas, Carl H W Meyer, Robert L Powers, Paul N Prentice, John L Smith, Walter L Tuchman: Cryptographic communication security for single domain networks. International Business Machines Corporation, Edwin Lester, December 9, 1980: US04238853 (151 worldwide citation)

A communication security system for data transmissions between remote terminals and a host system. The remote terminals and the host system include data security devices capable of performing a variety of cryptographic operations. At initialization time, a host master key is written into the host da ...


2
Richard E Lennon, Stephen M Matyas, Carl H W Meyer, Jonathan Oseas, Paul N Prentice, Walter L Tuchman: Cryptographic verification of operational keys used in communication networks. International Business Machines Corporation, Edwin Lester, March 11, 1980: US04193131 (124 worldwide citation)

In a data communication network providing communication security for communication sessions between a first station and a second station where each station has cryptographic apparatus provided with an operational key which should be common to both stations for cryptographic operations, an operationa ...


3
William F Ehrsam, Robert C Elander, Stephen M Matyas, Carl H W Meyer, Robert L Powers, Paul N Prentice, John L Smith, Walter L Tuchman: Cryptographic communication and file security using terminals. International Business Machines, Edwin Lester, May 31, 1983: US04386234 (46 worldwide citation)

A data security device which includes storage means for storing a master cipher key, cryptographic apparatus for performing cryptographic operations and control means for controlling the writing of a master cipher key into the storage means, controlling the transfer of the master cipher key to the c ...