Method, apparatus, and program product for enabling access...

Details Method, apparatus, and program product for enabling access... Method, apparatus, and program product for enabling access...

2011-01-04

2011-01-04

Ustaris, Joseph G (Department: 2433)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C705S076000, C380S044000

Reexamination Certificate

active

07865742

ABSTRACT:
A capability key is generated that provides access to sensitive information within a selectively encrypted data unit created from an unencrypted data unit. A user specifies access rights as a monotone boolean relationship between a selection of a list of attributes related to the unencrypted data unit. This relationship is used to compute a key descriptor. Next one or more shares of a master secret is generated responsive to the monotone boolean relationship and a random number. Next a unique capability key is computed from one or more cryptosystem parameters, the one or more shares and the random number. The unique capability key and the key descriptor together enable decryption of sensitive information within a selectively encrypted data unit created from an unencrypted data unit. Finally, the unique capability key and the key descriptor are provided to allow decryption of sensitive information within the selectively encrypted data unit.

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