Proving BIOS trust in a TCPA compliant system
US6993648B2 · kind B2 · utility
24Cited by
15References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2001 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Apr 29, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F8/65
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
When a flash unlock routine unlocks the flash memory to permit updating of a BIOS image, a message is left in secure non-volatile memory, such as a EEPROM. Upon the next re-boot, the boot block code will detect the special message in the non-volatile memory and perform a signature verification of the next block of code that is to be executed during the POST process. This code block will check the remainder of the BIOS image before POST proceeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.