Tamper resistant software encoding

Details Tamper resistant software encoding Tamper resistant software encoding

2005-01-11

2005-01-11

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Computer instruction/address encryption

C713S189000, C713S194000, C713S152000, C713S152000, C713S165000, C713S166000, C713S187000

Reexamination Certificate

active

06842862

ABSTRACT:
The present invention relates generally to computer software, and more specifically, to a method and system of making computer software resistant to tampering and reverse-engineering. “Tampering” occurs when an attacker makes unauthorized changes to a computer software program such as overcoming password access, copy protection or timeout algorithms. Broadly speaking, the method of the invention is to increase the tamper-resistance and obscurity of computer software code by transforming the data flow of the computer software so that the observable operation is dissociated from the intent of the original software code. This way, the attacker can not understand and decode the data flow by observing the execution of the code. A number of techniques for performing the invention are given, including encoding software arguments using polynomials, prime number residues, converting variables to new sets of boolean variables, and defining variables on a new n-dimensional vector space.

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