Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2001-05-22
2010-02-23
Revak, Christopher A (Department: 2431)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S270000, C380S277000, C380S044000, C713S159000, C713S168000, C713S171000, C713S176000, C713S180000, C713S181000, C726S003000, C726S009000, C455S410000
Reexamination Certificate
active
07668315
ABSTRACT:
Methods and apparatus are presented for providing local authentication of subscribers travelling outside their home systems. A subscriber identification token230provides authentication support by generating a signature370based upon a key that is held secret from a mobile unit220. A mobile unit220that is programmed to wrongfully retain keys from a subscriber identification token230after a subscriber has removed his or her token is prevented from subsequently accessing the subscriber's account.
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Quick, Jr. Roy F.
Rose Gregory G.
Kim Won Tae
Macek Kyong H.
Moorthy Aravind K
QUALCOMM Incorporated
Revak Christopher A
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