Instruction/data protection employing derived obscuring...

Details Instruction/data protection employing derived obscuring... Instruction/data protection employing derived obscuring...

2006-02-14

2006-02-14

Zand, Kambiz (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S189000, C713S190000, C380S037000, C380S042000, C380S043000

Reexamination Certificate

active

07000119

ABSTRACT:
A method and apparatus are described for protecting critical computer software and/or data with a large amount of obscuring instructions and or data to the extent that observing and understanding the obscured instructions and/or data is not humanly feasible. In a preferred method of obscuring software, a bank of obscuring instructions is prepared, a large number of obscuring instructions are selected from the bank and injected in the software code to be protected and a static image of the obscured sequence of code is encrypted and/or compressed. At execution, the obscured instructions are executed one at a time to make run time tracing a labor intensive process.

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