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:
Jul. 30, 2013
Filed:
Feb. 19, 2009
Inhyok Cha, Yardley, PA (US);
Yogendra C. Shah, Exton, PA (US);
Andreas U. Schmidt, Frankfurt am Main, DE;
Christian Hett, Niddatal, DE;
Inhyok Cha, Yardley, PA (US);
Yogendra C. Shah, Exton, PA (US);
Andreas U. Schmidt, Frankfurt am Main, DE;
Christian Hett, Niddatal, DE;
InterDigital Patent Holdings, Inc., Wilmington, DE (US);
Abstract
A method and apparatus to establish a trustworthy local time based on trusted computing methods are described. The concepts are scaling because they may be graded by the frequency and accuracy with which a reliable external time source is available for correction and/or reset, and how trustworthy this external source is in a commercial scenario. The techniques also take into account that the number of different paths and number of hops between the device and the trusted external time source may vary. A local clock related value which is protected by a TPM securely bound to an external clock. A system of Accuracy Statements (AS) is added to introduce time references to the audit data provided by other maybe cheaper sources than the time source providing the initial time.