Method an apparatus for encrypting and decrypting microprocessor

Cryptography – Cryptanalysis

Patent

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380 23, 380 25, 380 49, 380 50, 380 9, H04L 900

Patent

active

057745447

ABSTRACT:
A method and apparatus for encrypting and decrypting a microprocessor serial number. First and second encryption keys and a serial number are provided in microprocessor machine specific registers. The serial number is encrypted using the first key. The encrypted serial number is encrypted using the second key. The first encryption key may be encrypted along with the serial number using the second key. The double encrypted serial number is then stored in memory provided for that purpose.

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Dallas Semiconductor Corp.: "Section 1: Introduction," Oct. 6, 1993, Data Book Soft Microcontroller, pp. 1-3, 07/08, 73, 77-80, 82, 229, 290-292.
Electronics, "Designer's Dream Machine," vol. 60., No. 5, Mar. 1987, New York, US, pp. 53-57.
Ferreira, R.C.: "The Smart Card: A High Security Tool in EDP,"Philips Telecommunication Review, vol. 47, No. 3, Sep. 1, 1989, pp. 1-19.
International Search Report for PCT/US 97/05117 dated 08-04-97.
AMD5.sub.k Processor Technical Reference Manual, 1986 Advanced Micro Devices, Inc., pp. 3-29 through 3-31.

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