Secure memory management unit for microprocessor

Details Secure memory management unit for microprocessor Secure memory management unit for microprocessor

1996-09-20

1998-10-20

Cain, David

Cryptography

Cryptanalysis

380 25, H04L 900

Patent

active

058258787

ABSTRACT:
A secure embedded memory management unit for a microprocessor is used for encrypted instruction and data transfer from an external memory. Physical security is obtained by embedding the direct memory access controller on the same chip with a microprocessor core, an internal memory, and an encryption/decryption logic. Data transfer to and from an external memory takes place between the external memory and the memory controller of the memory management unit. All firmware to and from the external memory is handled on a page-by-page basis. Since all of the processing takes place on buses internal to the chip, detection of clear unencrypted instructions and data is prevented.

REFERENCES:
patent: 5377264 (1994-12-01), Lee
patent: 5386469 (1995-01-01), Yearsley
patent: 5452355 (1995-09-01), Coli
patent: 5459851 (1995-10-01), Nakajima

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