AUTHENTICATION KEY SHARING SYSTEM AND METHOD FOR NEWLY REGISTERING TERMINAL APPARATUS

摘要

To make it possible, even when the number of terminal apparatuses possessed by the same user has increased, to utilize an authentication key required for utilizing a Web service with high convenience from the terminal apparatuses while ensuring a given security level.SOLUTION: An authentication key sharing system 30A includes terminal apparatuses 32a, 32b comprising a terminal key management unit 46a that when personal identification information is presented and a registered terminal apparatus 32a having a terminal key (public) K3a paired with a terminal key (secret) K2a held by the own registered terminal apparatus 32a registered in a key store 33 exists, signs a terminal key (public) K3b paired with a terminal key (secret) K2b held by a new terminal apparatus 32b by using the terminal key (secret) K2a held by the registered terminal apparatus 32a, and transmits the signed terminal key (public) to the key store 33. The key store 33 comprises a terminal management unit 48 that when a signature of the signed terminal key (public) is verified using the terminal key (public) K3a of the registered terminal apparatus 32a held in the key store 33, registers the terminal key (public) K3b of the new terminal apparatus 32b in the key store 33.SELECTED DRAWING: Figure 2