Method and apparatus for re-synchronization of a stream...

Details Method and apparatus for re-synchronization of a stream... Method and apparatus for re-synchronization of a stream...

2007-01-02

2007-01-02

Zand, Kambiz (Department: 2132)

Cryptography

Communication system using cryptography

Wireless communication

C380S260000, C380S270000, C380S274000, C726S014000

Reexamination Certificate

active

10874765

ABSTRACT:
A method and apparatus for re-synchronizing a stream cipher during soft handoff. Transmitted quasi-secret keying information is used with a secret key to reinitialize a stream cipher generator located in a base station and a stream cipher generator located in a travelling mobile station. Since the quasi-secret keying information is uniquely determined according to each base station in the wireless telephone system, a base station's quasi-secret keying information and a shared secret key can also be used to create a new key. Thus, as the mobile station travels from one base station to another base station, a unique new key is generated for each base station.

REFERENCES:
patent: 5060266 (1991-10-01), Dent
patent: 5267261 (1993-11-01), Blakeney et al.
patent: 5778075 (1998-07-01), Haartsen
patent: 5805992 (1998-09-01), Schellinger
patent: 6052786 (2000-04-01), Tsuchida
patent: 6771776 (2004-08-01), Rose

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