Cryptography – Cryptanalysis
Patent
1993-01-29
1994-05-17
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 23, 380 25, 380 49, 380 50, 34082531, 34032834, H04L 900
Patent
active
053135202
ABSTRACT:
A method and a device are provided for protecting data stored in a ROM of a micoprogram control unit. Such data may take the form of a user program. To protect the data, predetermined code data is written into a predetermined address in the ROM. A code address inputted from outside the microprogram control unit is then compared with the predetermined address. If the inputted code address is determined to match the predetermined address, then code data inputted from outside the microprogram control unit is compared with the predetermined code data. Only after both of these comparisons are successfully made is the data in the ROM allowed to be read outside the microprogram control unit.
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HCMS 400 Series Handbook, Hitachi America Ltd., pp. 63-117 (Mar. 1988).
Gold Star Electron Co. Ltd.
Gregory Bernarr E.
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