Lexmark International, Inc.

Matthew David Clarke

Christopher Alan Adkins

James Ronald Booth

Graydon Randall Dodson

Adam Jude Ahne

Joshua Scott Potter

Ellis Matthew King

Methods for authenticating printer supply items using revocation lists are disclosed. Revocation lists are updated using DNSSEC to communicate between a printer and a DNS name server. A first domain name is created containing a request for a challenge to an authentication module and sent to the DNS name server. A second domain name is created containing a response to the challenge and sent to the DNS name server. The DNS name server indicates success or failure, which is used to authenticate the printer supply item. Other systems and methods are disclosed.

Systems and methods for authentication of printer supply items

Systems and methods for authenticating printer supply items using revocation lists are disclosed. Revocation lists are updated using DNSSEC to communicate between a printer and a DNS name server. A domain name is created containing a printer supply item serial number, a message digest, and a message authentication code. The domain name is sent to the DNS name server, and the returned IP address is used to update a revocation list. Other systems and methods are disclosed.

Growing community of inventors

Lexington, KY, United States of America

Matthew David Clarke