Electrical computers and digital processing systems: support – Computer program modification detection by cryptography
Reexamination Certificate
2005-02-04
2010-12-14
Homayounmehr, Farid (Department: 2434)
Electrical computers and digital processing systems: support
Computer program modification detection by cryptography
C713S188000, C713S189000, C713S194000
Reexamination Certificate
active
07853798
ABSTRACT:
A program tamper detecting apparatus includes an external memory, an activation ROM and a CPU. The external memory stores a first code for program tamper detecting and a first program, wherein the first program is encrypted. The activation ROM stores a second program for decrypting the first program. The CPU is electrically connected to the external memory and the activation ROM. The CPU decrypts the first program by executing the second program to obtain the decrypted first program. The CPU detects tampering of the first program based on a comparison between the first code and a result of a predetermined operation executed on second codes of the decrypted first program.
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Homayounmehr Farid
Kaplan Benjamin A
McGinn IP Law Group PLLC
NEC Electronics Corporation
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