United States Patent 9,396,361
Schmidt , et al. July 19, 2016
Method and apparatus for protecting time values in wireless communications
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.
Inventors:
Schmidt; Andreas (Frankfurt am Main, DE), Hett; Christian (Niddatal, DE), Shah; Yogendra C. (Exton, PA), Cha; Inhyok (Seoul, KR)
Applicant:
Name
City
State
Country
Type
InterDigital Patent Holdings, Inc.
Wilmington
DE
US
Assignee:
InterDigital Patent Holdings, Inc. (Wilmington, DE)
Family ID:
1000001982422
Appl. No.:
13/949,677
Filed:
July 24, 2013
Prior Publication Data
Document Identifier
Publication Date
US 20130312125 A1 Nov 21, 2013
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
12389088 Feb 19, 2009 8499161
61029669 Feb 19, 2008
Current U.S. Class: 1/1
Current CPC Class: G06F 21/81 (20130101); G06F 21/725 (20130101); H04L 63/123 (20130101); H04W 12/10 (20130101); H04L 2463/101 (20130101); H04L 2463/121 (20130101)
Current International Class: G06F 21/44 (20130101); H04L 29/06 (20060101); H04W 12/10 (20090101); G06F 21/81 (20130101); G06F 21/72 (20130101)
Field of Search: ;726/36
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