Tamper resistant software-control flow encoding
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United States of America Patent
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Aug 17, 2004
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N/A
app pub date -
Aug 19, 1999
filing date -
Aug 19, 1999
priority date (Note) -
Expired
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Abstract
The present invention relates to a method and system of making computer software resistant to tampering and reverse-engineering. 'Tampering' refers to making unauthorized changes to software, such as bypassing password checks, which are of benefit to the tamperer or of detriment to the provider or vendor of the software. Thus, tampering does not denote arbitrary destructive changes, such as causing the software to fail completely. Broadly speaking, the method of the invention is to increase the tamper-resistance and obscurity of software so that the observable operation of the transformed software is dissociated from the intent of the original code, and so that the functionality of the software is extremely fragile when modified: any modification will, with high probability, produce persistently nonsensical behaviour. These effects are achieved by converting the control-flow of the software into data-driven form, and increasing the complexity of the control-flow by orders of magnitude.
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