Telegraphy – Systems – Printing
Patent
1978-03-31
1982-01-12
Thomas, James D.
Telegraphy
Systems
Printing
178 2209, 34082531, 235382, 364900, H04L 900
Patent
active
043107206
ABSTRACT:
A communications link between a computer and a remote user is effected by a portable access unit which generates a nonrecurring access code which is a function of a password and a pseudorandomly generated number. The access code is transmitted and compared with an access code generated by a computer access controller. In addition to the access code, the pseudorandomly generated number provides an encryption key which is not transmitted but corresponds to a mating encryption key generated at the controller. The mating encryption keys are utilized to set up data transmission enciphering/deciphering networks successive links are established by incremented pseudorandomly generated access codes.
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Proceedings of the IEEE, vol. 63, No. 11, Nov. 1975, "Some Cryptographic Techniques for Machine-to-Machine Data Communications", Feistel, Notz, and Smith, pp. 1545 to 1554.
Pitchenik David E.
Pitney Bowes Inc.
Scribner Albert W.
Soltow, Jr. William D.
Thomas James D.
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