Implementation of a secure computing environment by using a...

Details Implementation of a secure computing environment by using a... Implementation of a secure computing environment by using a...

2007-12-25

2007-12-25

Zia, Syed A. (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S190000, C713S189000, C713S169000, C726S012000, C726S022000, C726S034000

Reexamination Certificate

active

10335315

ABSTRACT:
A computer system with a secure bootloading function is disclosed. Security logic (20) is implemented on-chip with a central processing unit (CPU) (10), and performs security functions following a system reset, such as upon power-up or a hardware or software reset. A security key value from a security key store (36), which is read-protected from subsequent read accesses, is used to authenticate each code block associated with secure applications. Write-protect registers (34) store the memory addresses of authenticated code blocks, so that these code blocks cannot be altered. A shadow memory (32) is provided on-chip with the CPU (10), to which access is granted for program instructions having a physical memory address within the memory address ranges stored in the write-protect registers (34), and thus usable by the secure applications. Successful authentication of the user code block ensures that the bootloaded code is not corrupt, prior to passing control to the operating system.

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A.J. Menezes, P.C. van oorschot, S.A. Vanstone “Handbook of Applied Cryptography” (1997) CRC Press. Section 11.3.1-11.3.3.

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