Patent ID: 8005969
Filing Date: 2011-08-23
Classification: G06Q,H04L,H04N

Abstract:
1. A communication system, comprising a server and at least one client, the communication system being configured to establish, between the server and the at least one client, a first communication based on a first protocol and a second communication based on a second protocol with higher security than the first protocol, wherein the server comprises a server-side processor configured to control: wherein each of the at least one client comprises a client-side processor configured to control: wherein the first information comprises issuer information of a client certificate stored in the at least one client, the issuer information representing an issuer of the client certificate who has given a digital signature, wherein the second information comprises subject information of a CA (Certificate Authority) certificate, stored in the server, for verifying the client certificate, the subject information representing an owner of the CA certificate, wherein the judging unit is configured to judge whether the issuer information of the client certificate is identical to the subject information of the CA certificate for verifying the client certificate, and wherein the command sending unit is configured to send, to the at least one client, with the server, the command to instruct to send the request for establishing the second communication when the judging unit judges that the issuer information of the client certificate is identical to the subject information of the CA certificate for verifying the client certificate.