Protecting access to microcontroller memory blocks

Details Protecting access to microcontroller memory blocks Protecting access to microcontroller memory blocks

2005-10-04

2005-10-04

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

C713S152000, C713S152000, C713S193000, C711S163000, C711S164000

Reexamination Certificate

active

06952778

ABSTRACT:
A microcontroller provides protection to memory blocks in an embedded memory. A set of rules such as security levels mapped to memory blocks are stored in a nonvolatile supervisory memory. An algorithm for application of the rules is stored in a supervisory ROM. When a read or write operation is to be carried out, the rules are applied according to the algorithm in order to authorize or reject the read or write operation. Security levels can be modified, but only according to defined rules. In one embodiment, the security levels can only be increased.

REFERENCES:
patent: 5202687 (1993-04-01), Distinti
patent: 5737760 (1998-04-01), Grimmer et al.
patent: 6003133 (1999-12-01), Moughanni et al.
patent: 6144327 (2000-11-01), Distinti et al.
patent: 6339815 (2002-01-01), Feng et al.
Atmel Corporation: AT90SC Summay: “Secure Microcontrollers for Smart Cards”, Oct. 1999, pp. 1-7.

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