Cryptography – Key management – Having particular key generator
Patent
1994-09-16
1996-08-13
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 34, 380 21, 380 20, 380 49, 380 9, 380 10, 380 43, 380 46, H04L 918, H04L 912
Patent
active
055464645
ABSTRACT:
In a ciphered digital cellular communications system a method and apparatus are presented for selective resynchronization of the cipher upon initial channel acquisition or handoff. Where synchronization between the old channel and the new channel exists, the base station indicates along with an ITCD or handover message that no resynchronization is required. Where synchronization between the old channel and the new channel does not exist, the base station provides an indication along with an ITCD or handover message that resynchronization is required and from the content of this message the manner in which resynchronization is to be achieved is further indicated. By providing options for resynchronization security may be optimized or compromised for handover speed depending upon the specific requirements of the base station or the mobile station.
REFERENCES:
patent: 5060266 (1991-10-01), Dent
patent: 5081679 (1992-01-01), Dent
patent: 5241598 (1993-04-01), Raith
patent: 5293423 (1994-03-01), Dahlin et al.
patent: 5404355 (1995-04-01), Raith
Dent Paul W.
Raith Krister A.
Ericsson Inc.
Samra Robert A.
Sayadian Hrayr A.
Stasik Eric L.
Tarcza Thomas H.
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