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:
Apr. 03, 1990
Filed:
Feb. 01, 1988
Ezzat A Dabbish, Buffalo Grove, IL (US);
John P Byrns, Hoffman Estates, IL (US);
Michael J McClaughry, Cary, IL (US);
Larry C Puhl, Sleepy Hollow, IL (US);
Daniel P Brown, Elmhurst, IL (US);
Eric F Ziolko, Schaumburg, IL (US);
Michael W Bright, Arlington Heights, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing mechanism includes at least one electrically erasable, programmable gate array containing a portion of the cipher algorithm and at least one random access memory device coupled to the array for storing digital data generated by the algorithm. A mechanism which is coupled to the gate array and memory device controls the execution of the algorithm for each digital word thereby decrypting encrypted digital words and encrypting non-encrypted digital words.