Patent ID: 8578466

Claim:
A communication apparatus for communicating with a destination apparatus via a network, the communication apparatus comprising: a memory unit configured to memorize a plurality of certificates including a first certificate and a second certificate; a first authentication unit configured to authenticate said destination apparatus, when communicating with said destination apparatus, by using the first certificate that contains an identification information received from said destination apparatus and uniquely identifies said destination apparatus; a second authentication unit configured to carry out authentication of said destination apparatus, when said authentication by said first authentication unit has failed, by using the second certificate not containing an identification information received from said destination apparatus, the identification information uniquely identifying said destination apparatus; and a transmission unit configured to transmit, when authentication by said second authentication unit has been successful, a certification update request requesting updating of said first certificate and a certificate for updating said first certificate to said destination apparatus, wherein authentication of the destination apparatus is performed by using the first certificate when accepting a request from the destination apparatus, and authentication of the destination apparatus is performed by using the second certificate when accepting a request for updating the first certificate from the destination apparatus.