The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2004
Filed:
Aug. 19, 1999
Cloakware Corporation, Ottawa, CA;
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.