Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-07-17
1997-03-25
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 49, 375200, 379 58, 379 59, 455 331, 455 531, 455 541, H04L 900
Patent
active
056152671
ABSTRACT:
A method for adaptively switching between the WS and S authentication schemes is based on the customer's usage. A first preferred embodiment provides a 2n-1 state automaton (where n>1), which switches from the WS Scheme to the S Scheme when the automaton passes from state n-1 to state n, and vice versa. At each new registration, the automaton increases one state if more than 1 call was made (i.e., incoming or outgoing) during the cycle; decreases one state if no calls were made during the cycle; and remains the same if 1 call was made during the cycle. The value of n is preferably determined by the PSP based on customer usage. A second preferred embodiment begins each new cycle with the WS Scheme, and will switch to the S Scheme if a call is made during the registration.
REFERENCES:
patent: 5163097 (1992-11-01), Pegg
S. Mohan, "Network Impacts of Privacy and Authentication Protocols for PCS", 1995 IEEE International Conference on Communications, Jun. 18-22, 1995, pp. 1557-1561.
EIA/TIA Cellular Radio Telecommunications Intersystem Operations: Authentication, Signaling Message Encryption, and Voice Privacy, Technical Report, TSB-51, EIA/TIA 1993.
Lin Jason Y.
Mohan Seshadri
Sherry Howard
Sollenberger Nelson R.
Bell Communications Research Inc.
Falk James W.
Giordano Joseph
Gregory Bernarr E.
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