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:
May. 20, 1997
Filed:
Oct. 23, 1995
Thomas J Balph, Mesa, AZ (US);
Steven D Millman, Chandler, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An electronic key validation process increases security by encrypting the security access codes. A key (10) receives data having a hidden polynomial select code and polynomial seed from a host (12). A locally stored (24, 26) select offset and seed offset in the key identifies the location (22) of the select code and seed in the data. The select code decodes (32) into polynomial coefficients which are used to configure a polynomial generator (34). The seed is loaded into the polynomial generator as a starting point of the polynomial. The polynomial generator is clocked a number of cycles to calculate a remainder. The select code is modified (28) to select a new polynomial, and the polynomial generator is clocked another number of cycles. The host runs a similar encryption algorithm. The remainder is sent to the host where it is compared with the host generated remainder for key validation.