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:
May. 20, 2003
Filed:
Feb. 01, 1999
Kevin J. Ziese, Dripping Springs, TX (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Tamper-resistant software is provided by determining an initial value of a specified property for an executable file. The executable file is then encrypted based on the initial value of the specified property. The initial value of the specified property is associated with the encrypted executable file and later used to decrypt the encrypted executable file. An execution-time value of the specified property is determined for the decrypted executable file. The execution-time value of the specified property is compared to the initial value of the specified property to determine whether tampering has occurred. The decrypted executable file is executed in response to the execution-time value of the specified property matching the initial value of the specified property.