Cryptography – Key management – Key distribution
Reexamination Certificate
2006-08-29
2006-08-29
Jung, David (Department: 2134)
Cryptography
Key management
Key distribution
C380S281000, C380S282000
Reexamination Certificate
active
07099477
ABSTRACT:
A method and system for backup and restore of a context encryption key (CEK) for a trusted device within a secured processing system maintains security of virtualized trusted device contexts, providing for replacement of a trusted device in the field. The CEK is encrypted along with a system identifier by a random number to yield a first result. The first result is again encrypted with a manufacturer public key. The resulting blob is stored along with the random number. To restore, the system sends the blob and the device ID to a server. The server obtains the first result by decrypting with the manufacturer private key, re-encrypts with the device public key and sends the new result back. The system sends the new result to the device along with the associated random number. The device decrypts the new result using its private key and decrypts the CEK using the random number.
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Bade Steven A.
Challener David Carroll
Harris Andrew M.
Jung David
Mitch Harris, LLC
Salys Casimer K.
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