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. 12, 2008
Filed:
Oct. 16, 2004
David Carroll Challener, Raleigh, NC (US);
Daryl Carvis Cromer, Apex, NC (US);
Joseph Wayne Freeman, Raleigh, NC (US);
Steven Dale Goodman, Raleigh, NC (US);
James Patrick Hoff, Raleigh, NC (US);
Howard Jeffrey Locker, Cary, NC (US);
Randall Scott Springfield, Chapel Hill, NC (US);
James Peter Ward, Apex, NC (US);
David Carroll Challener, Raleigh, NC (US);
Daryl Carvis Cromer, Apex, NC (US);
Joseph Wayne Freeman, Raleigh, NC (US);
Steven Dale Goodman, Raleigh, NC (US);
James Patrick Hoff, Raleigh, NC (US);
Howard Jeffrey Locker, Cary, NC (US);
Randall Scott Springfield, Chapel Hill, NC (US);
James Peter Ward, Apex, NC (US);
Lenovo (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A method and system for enabling security attestation for a computing device during a return from an S4 sleep state. When the computing device enters into the S4 state following a successful boot up, the attestation log is appended to the TPM tick count and the log is signed (with a security signature). When the device is awaken from S4 state, the BIOS obtains and verifies the log created during the previous boot. The CRTM maintains a set of virtual PCRs and references these virtual PCRs against the log. If the values do not match, the return from S4 state fails and the device is rebooted.