Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2004-09-10
2010-10-19
Cervetti, David García (Department: 2436)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S173000, C713S192000, C713S194000, C713S156000, C726S027000, C726S034000
Reexamination Certificate
active
07818574
ABSTRACT:
A mechanism is provided in which access to the functionality present on an integrated circuit chip is controllable via an encrypted certificate of authority which includes time information indicating allowable periods of operation or allowable duration of operation. The chip includes at least one cryptographic engine and at least one processor. The chip also contains hard coded cryptographic keys including a chip private key, a chip public key and a third party's public key. The chip is also provided with a battery backed up volatile memory which contains information which is used to verify authority for operation. The certificate of authority is also used to control not only the temporal aspects of operation but is also usable to control access to certain functionality that may be present on the chip, such as access to some or all of the cryptographic features provided in conjunction with the presence of the cryptographic engine, such as key size.
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Fayad Camil
Li John K.
Sutter Siegfried
Cervetti David García
Chiu, Esq. Steven
Heslin Rothenberg Farley & & Mesiti P.C.
International Business Machines - Corporation
Schiller, Esq. Blanche E.
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