Information security – Access control or authentication – Authorization
Reexamination Certificate
2011-02-08
2011-02-08
Vu, Kimyen (Department: 2435)
Information security
Access control or authentication
Authorization
C713S176000, C455S410000, C455S411000
Reexamination Certificate
active
07886355
ABSTRACT:
A method for controlling subsidy locking of a handset device includes storing, in a handset device, an asymmetrically digitally signed subsidy unlock data block that has been modified based on a password after signing (505); modifying the stored unlock data block based on a received subsidy unlock password (510); and granting subsidy unlock status if the asymmetric digital signature of the modified, stored unlock data block properly verifies (510). A method (110) for controlling subsidy locking of a handset device includes storing, in the handset device, an asymmetrically digitally signed subsidy unlock data block that comprises a password portion that has been modified after signing (112); replacing the contents of the modified password portion with a received subsidy unlock password to produce an updated subsidy unlock data block (116); and granting subsidy unlock status if the asymmetric digital signature of the updated subsidy unlock data block properly verifies (118).
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Debates Scott P.
Rager Kent D.
Voss Joel D.
Motorola Mobility, Inc.
Nguy Chi
Vu Kimyen
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