Device and method with reduced information leakage

Details Device and method with reduced information leakage Device and method with reduced information leakage

2007-03-20

2007-03-20

Barrón, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C713S193000, C380S281000, C380S286000

Reexamination Certificate

active

10284548

ABSTRACT:
The invention is directed to a data-processing system comprising a processor, a second encrypted cryptographic key stored in a first persistent memory, and a cryptographic co-processor that comprises a first register and a second register. The cryptographic co-processor serves for decrypting in a decryption step the second encrypted cryptographic key, thereby generating therefrom a second unencrypted cryptographic key that is usable by the processor for executing an operation. For the decryption step the first register is loadable with the second encrypted cryptographic key and the second register is loadable with a first cryptographic key. The resulting second unencrypted cryptographic key is maintainable in one of the registers for being used by the cryptographic co-processor for decrypting encrypted information or encrypting unencrypted information for the operation.

REFERENCES:
patent: 4888802 (1989-12-01), Cooney
patent: 5457748 (1995-10-01), Bergum et al.

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