COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND ENCRYPTION COMMUNICATION CONTROL METHOD

• Main Authors: TAGUCHI HIROYASU, SHODA YOSHINARI, ISOBE MASAYA, ICHIMURA KAZUYOSHI, HATTORI YUJI, FUKUNAGA YOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 15.11.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To avoid discarding a packet due to a change of an encryption key.SOLUTION: A communication device for bi-directionally transmitting and receiving packets encrypted with an encryption key to and from an opposite device includes: a transmitting unit for transmitting an update request message to the encryption key; a receiving unit for receiving a new encryption key and timing information indicating timing of change to the new encryption key at the communication device and the opposite device from the opposite device; and a processing unit for changing the encryption key used for encrypting packets to the new encryption key at timing based on the timing information.SELECTED DRAWING: Figure 7 【課題】暗号化キーの変更によるパケットの破棄を回避する。【解決手段】暗号化キーで暗号化されたパケットを対向装置と双方向で送受信する通信装置は、暗号化キーの更新要求メッセージを送信する送信部と、新規の暗号化キーと、通信装置及び対向装置における新規の暗号化キーへの変更のタイミングを示すタイミング情報とを対向装置から受信する受信部と、前記タイミング情報に基づくタイミングでパケットの暗号化に使用する暗号化キーを新規の暗号化キーに変更する処理部とを含む。【選択図】図７