The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1995
Filed:
Feb. 02, 1994
Applicant:
Inventor:
Vincent J Coli, Mountain View, CA (US);
Assignee:
VLSI Technology, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
380-4 ; 380 50 ; 364D / ; 364D / ; 3642466 ; 3649694 ; 3642469 ; 3649693 ;
Abstract
The present invention is directed to providing a level of security on a chip which makes accessing stored data so burdensome that it is outweighed by the cost of merely purchasing the chip through conventional, legal avenues. In accordance with the present invention, secure data stored in a circuit cannot be accessed without destroying circuit operation, nor can the circuit be reverse engineered without significant time, cost and expense. For example, where the secure data stored on an ASIC includes a data encryption key, the key cannot be accessed or be modified to create a new key without destroying circuit operation.