COMMUNICATION SYSTEM AND TERMINAL DEVICE

• Main Authors: KAIEDA YOHEI, MATSUBARA AKIFUMI, KUNII HIROKI
• Format: Patent
• Language: English; Japanese
• Published: 08.11.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To provide a communication system and a terminal device capable of executing authentication processing for reducing the load on a communication device, a server device, or the like while ensuring safety by performing device authentication by using an electronic certificate having a key length of an appropriate length corresponding to the performance or the like of a device.SOLUTION: A communication system according to the present invention includes a key length determination unit that determines a key length of a key corresponding to a service certificate according to a service period of the service certificate in the terminal device, a device specification of the terminal device, or authentication frequency of the terminal device, and the terminal device includes a terminal storage unit that stores the service certificate, transmits a request to reissue the service certificate stored in the terminal storage unit to a certificate management device, and updates the storage content of the terminal storage unit with a new service certificate received from the certificate management device, and the certificate management device transmits the new service certificate corresponding to the key of the key length determined by the key length determination unit to the terminal device when a reissue request has been received from the terminal device.SELECTED DRAWING: Figure 2 【課題】本発明は、機器の性能等に応じた適切な長さの鍵長からなる電子証明書を用いて機器認証を行うことにより、安全性を担保しつつ、通信機器又はサーバ装置等の負荷を低減させる認証処理を可能とする通信システム及び端末装置を提供することを目的とする。【解決手段】本発明に係る通信システムは、端末装置におけるサービス証明書の使用期間、端末装置の装置仕様、又は、端末装置の認証頻度に応じて、サービス証明書に対応する鍵の鍵長を決定する鍵長決定部を有し、端末装置は、サービス証明書を記憶する端末記憶部と、端末記憶部に記憶されたサービス証明書の再発行要求を証明書管理装置に送信し、証明書管理装置から受信した新たなサービス証明書によって端末記憶部の記憶内容を更新し、証明書管理装置は、端末装置から再発行要求を受信した場合に、鍵長決定部が決定した鍵長の鍵に対応する新たなサービス証明書を端末装置に送信する。【選択図】図２