Protection of the core part of computer against external...

Details Protection of the core part of computer against external... Protection of the core part of computer against external...

2005-10-25

2005-10-25

Morse, Gregory (Department: 2134)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

C714S010000

Reexamination Certificate

active

06959391

ABSTRACT:
A method is proposed for protecting the central processing unit of a computer, in particular a smart card. Individual security-related registers are logically combined to form a check sum after the CPU has executed an instruction. The check sum is stored and compared with an accordingly formed check sum before the onset of processing of the next instruction. If the compared check sums fail to match, this indicates manipulation of the register contents of the CPU in the time period between the execution of the two instructions. In such a case a corresponding error message is issued and the processor stopped or the card confiscated.

REFERENCES:
patent: 4727544 (1988-02-01), Brunner et al.
patent: WO 97 04394 (1997-02-01), None
Radai, Y., “Checksumming Techniques for Anti-Viral Purposes,” Virus Bulletin Conference, GB, Virus Bulletin Ltd., Abington, Sep. 1991.

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