Dual purpose security architecture with protected internal opera

Details Dual purpose security architecture with protected internal opera Dual purpose security architecture with protected internal opera

1995-01-06

1997-03-25

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 49, H04L 900

Patent

active

056152639

ABSTRACT:
A secure mode within a dual mode processor is implemented. In a general/external mode, the dual mode processor executes instructions provided from an external source. The instructions are supplied to the processor via input/output to the processor. Upon receiving a special software or hardware interrupt, the dual mode processor enters a secure/internal mode. The interrupt specifies a secure function stored in a read-only memory within the dual mode processor. Upon receiving such an interrupt, input/output to the dual mode processor is disabled. The identified secure function is executed by the processor. During execution of the secure function, any attempt to insert instructions not originating from the read-only memory are ignored. However, the processor may access data specifically identified by secure function being executed. Upon completion of performance of the secure function, an exit routine is executed to enable input/output to the processor and resume execution of instructions provided via input/output from the source external to the processor.

REFERENCES:
patent: 4493028 (1985-01-01), Heath
patent: 5014191 (1991-05-01), Padgaonkar et al.
patent: 5400334 (1995-03-01), Hayssen
Ipower Data Security Cards, National Semiconductor Corp. (ipower Business Unit), 1090 Kifer Road (MS 16225) Sunnyvale, CA 94086 (408) 721-8797, Lit. No. 200025-002, 1994.

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