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William F Ehrsam, Robert C Elander, Stephen M Matyas, Carl H W Meyer, Richard J Sahulka, Walter L Tuchman: Cryptographic file security for multiple domain networks. International Business Machines Corporation, Edwin Lester, May 13, 1980: US04203166 (203 worldwide citation)

A file security system for data files created at a first host system in one domain and recovered at a second host system in another domain of a multiple domain network. Each of said host systems contain a data security device provided with multiple host keys capable of performing a variety of crypto ...


2
William F Ehrsam, Robert C Elander, Stephen M Matyas, Carl H W Meyer, John L Smith, Walter L Tuchman: Cryptographic file security for single domain networks. International Business Machines Corporation, Edwin Lester, December 9, 1980: US04238854 (186 worldwide citation)

A file security system for data files associated with a host data processing system. The host system includes a data security device which contains a secure host master key and is capable of performing a variety of cryptographic operations. At initialization time, the host system generates a series ...


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 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 ...


4
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 ...


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William F Ehrsam, Robert C Elander, Lloyd L Hollis, Richard E Lennon, Stephen M Matyas, Carl H W Meyer, Jonathan Oseas, Walter L Tuchman: Cryptographic communication security for multiple domain networks. International Business Machines Corporation, Edwin Lester, October 7, 1980: US04227253 (122 worldwide citation)

A communication security system for data transmissions between different domains of a multiple domain communication network where each domain includes a host system and its associated resources of programs and communication terminals. The host systems and communication terminals include data securit ...


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Robert C Elander, Richard E Lennon, Stephen M Matyas, Carl H W Meyer, Robert E Shuck, Walter L Tuchman: Cryptographic application for interbank verification. International Business Machines Corporation, Edwin Lester, February 19, 1985: US04500750 (65 worldwide citation)

In a data communication network which includes terminals interconnected via a central switch, a process for verifying the identity of a terminal user who is provided with secret data associated with his identity. In carrying out the verification process, the secret data is first encrypted at the ter ...


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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 ...


8
Stephen M Matyas, Carl H W Meyer, Walter L Tuchman: Digital signature system and apparatus. International Business Machines Corporation, W S Robertson, June 3, 1980: US04206315 (41 worldwide citation)

A digital signature machine provides a simplified method of forming and verifying a signature that is appended to a digital message. A sender transmits a signature with the usual signature keys and with validation table entries that correspond to the unsent keys and with the compressed encoding of t ...


9
William F Ehrsam, Carl H W Meyer, John L Smith, Walter L Tuchman: Message verification and transmission error detection by block chaining. International Business Machines Corporation, Edwin Lester, February 14, 1978: US04074066 (40 worldwide citation)

A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station.


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