What is a PKI certificate and how can I obtain one?

A PKI (Public Key Infrastructure) certificate is a digital certificate issued by the USPTO to registered patent attorneys, registered patent agents, independent inventors, and limited recognition practitioners. The PKI certificate ensures your transmission via EFS-Web against unauthorized viewing, and allows you to view recent submissions in Private PAIR. More information regarding how to obtain a digital certificate is available at Customer Numbers and Digital Certificates. It is recommended that EFS users obtain a customer number and digital certificate as soon as possible so that USPTO can provide the most complete information and support possible.

USPTO FAQ - Questions and Answers (31AUG2006)