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:
Jun. 20, 2006
Filed:
Mar. 28, 2000
Curtis Lee Cornils, Chandler, AZ (US);
Erwin Perry Comer, Queen Creek, AZ (US);
Curtis Lee Cornils, Chandler, AZ (US);
Erwin Perry Comer, Queen Creek, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A secure communications system (, FIG.) with a compromised communications node can quickly recover from the compromised condition by sending re-keying messages using a key encryption key hierarchy (, FIG.). Each communications node (, FIG.) includes a memory (, FIG.) with a list of tier-group specific key encryption keys, and whenever a message arrives that is encrypted with a key encryption key in the list, the communications node decrypts the message. When the message includes a new traffic encryption key, the communications node has been re-keyed. Key encryption keys are managed hierarchically such that many communications nodes can be re-keyed with very few broadcast messages, thereby saving communications resources.