Method and apparatus for re-synchronization of a stream cipher during handoff
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United States of America Patent
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Aug 3, 2004
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N/A
app pub date -
Nov 11, 1999
filing date -
Nov 11, 1999
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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.
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