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:
Oct. 27, 2015
Filed:
Nov. 09, 2006
Arun P. Anbalagan, Tamil Nadu, IN;
Pruthvi P. Nataraj, Karnataka, IN;
Bipin Tomar, Bangalore, IN;
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
A trusted device having virtualized registers provides an extensible amount of storage for hash values and other information stored within a trusted device. The trusted device includes a buffer to which registers are virtualized to and from external storage, by encrypting the register values using a private device key. The registers may be platform control registers (PCRs) or other storage of the trusted device, which may be a trusted platform module (TPM). The registers are accessed in accordance with a register number. When the externally stored values are retrieved, they are decrypted and placed in the buffer. The buffer may implement a cache mechanism, such as a most recently used algorithm, so that encryption/decryption and fetch overhead is reduced. A register shadowing technique may be employed at boot time, to ensure that the trusted device is not compromised by tampering with the externally stored virtualized registers.