Device and method for managing public key certificate attached to electronic mail and storage medium

Abstract

A certificate managing device has a verifying section that verifies validity of a first public key certificate corresponding to a originating mail address when an electronic mail to which the first public key certificate is attached is received, a comparing section that compares newness of the first public key certificate with newness of a second public key certificate which is already registered as a public key certificate corresponding to the originating mail address, and a registering section that registers the first public key certificate as the public key certificate corresponding to the originating mail address in place of the second public key certificate when the first public key certificate is more recent than the second public key certificate.

Dependencies are inferred from the claim text.