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:
Mar. 09, 2010
Filed:
Jan. 07, 2005
Dinarte Morais, Redmond, WA (US);
Jon Lange, Bellevue, WA (US);
Daniel R. Simon, Redmond, WA (US);
Ling Tony Chen, Bellevue, WA (US);
Josh D. Benaloh, Redmond, WA (US);
Dinarte Morais, Redmond, WA (US);
Jon Lange, Bellevue, WA (US);
Daniel R. Simon, Redmond, WA (US);
Ling Tony Chen, Bellevue, WA (US);
Josh D. Benaloh, Redmond, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Machine instructions comprising a bootstrap code are buried within a critical component of an electronic game console where they cannot readily be accessed or modified. A preloader portion in a read only memory (ROM) is hashed by the bootstrap code and the result is compared to an expected hash value maintained in the bootstrap code. Further verification of the boot-up process is carried out by the preloader, which hashes the code in ROM to obtain a hash value for the code. The result is verified against a digital signature value that defines an expected value for this hash. Failure to obtain any expected result terminates the boot-up process. Since the bootstrap code confirms the preloader, and the preloader confirms the remainder of the code in ROM, this technique is useful for ensuring that the code used for booting up the device has not been modified or replaced.