Method for effective tamper resistance

Details Method for effective tamper resistance Method for effective tamper resistance

2011-08-09

2011-08-09

Srivastava, Vivek (Department: 2433)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C713S187000, C713S194000

Reexamination Certificate

active

07996685

ABSTRACT:
A system, method, and computer program product for preventing a malicious user from analyzing and modifying software content. The one-way functions used in prior art systems using dynamically evolving audit logs or self-modifying applications are replaced with a one-way function based on group theory. With this modification, untampered key evolution will occur inside a defined mathematical group such that all valid key values form a subgroup. However, if the program is altered, the key will evolve incorrectly and will no longer be a member of the subgroup. Once the key value is outside of the subgroup, it is not possible to return it to the subgroup. The present invention provides a limited total number of valid keys. The key evolution points are not restricted to locations along the deterministic path, so the key can be used in various novel ways to regulate the program's behavior, including in non-deterministic execution paths.

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