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:
Nov. 08, 1994
Filed:
Mar. 26, 1993
Applicant:
Inventors:
Kent D Rager, Elgin, IL (US);
Steven H Lay, Elgin, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 21 ; 380 50 ;
Abstract
An encryption code and at least one key are provided to a secure transmission device, via an external keying device, and stored in a first volatile memory. An encrypted representation of the at least one key, based on the encryption code and the at least one key, is generated and stored in a non-volatile memory. Upon power down of the secure transmission device, the encryption code is stored in a second volatile memory and the at least one key and encryption code stored in the first volatile memory are erased.