Program creation method and program execution method

Details Program creation method and program execution method Program creation method and program execution method

2005-08-23

2005-08-23

Barron, Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C713S190000, C713S193000, C713S194000, C713S152000

Reexamination Certificate

active

06934850

ABSTRACT:
First program10comprises encrypted code modules11, 13, and15, decryption code modules12a, 14a, and16aof encrypted code modules12, 14, and16, and a first decryption processing code module30. Also, second program20comprises encrypted code modules12, 14, and16, decryption code modules11a, 13a, and15aof the encrypted code modules11, 13, and15, and a second decryption processing code module31. The encrypted code modules11-16, which are created by encrypting processing code modules, are not converted back to the processing modules that perform original processing unless they are decrypted by the first and second decryption processing code modules30and31, respectively.

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“Protection of software against reverse-analysis (tampering) and alteration (modification)—tamper-resistant software technology”,Nikkei Electronics, 706: 209-220 (1998).

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