Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Reexamination Certificate
1998-09-16
2001-08-28
Trammell, James P. (Department: 2161)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
C713S164000
Reexamination Certificate
active
06282657
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to kernel mode protection, and more particularly relates to an apparatus and method that enforces a security perimeter around cryptographic functions.
DESCRIPTION OF THE PRIOR ART
The concept of privileged separation of software processes is known in the art. Having one software process work in a privileged/secure environment and another software process working in an unprivileged
on-secure environment is typically controlled by the hardware within a processor. The hardware that supports privileged separation is fundamentally integrated throughout the processor mask. Integrating the hardware throughout the processor is expensive and increases the size of the processor. Smaller processors, such as digital signal processors (DSPs), do not include privileged separation hardware features. The hardware is not included in the processors to keep the size and cost of the processors down.
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Kaplan Michael M.
Ober Timothy
Reed Peter
Elisca Pierre E.
Hoffman & Baron LLP
SafeNet, Inc.
Trammell James P.
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