公开(公告)号：US20240364672A1

公开(公告)日：2024-10-31

申请号：US18292075

申请日：2021-08-25

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Tetsuya OKUDA ,  Misato NAKABAYASHI ,  Koji CHIDA ,  Yuri TANAKA ,  Kazuki YAMAMURA ,  Sakae CHIKARA ,  Kazuo MORIMURA

IPC分类号： H04L9/40 ,  H04L9/08

CPC分类号： H04L63/061 ,  H04L9/0852

摘要： According to an embodiment, a key exchange system includes: a key generation device configured to generate a key based on quantum key exchange or post-quantum key exchange; a network device configured to perform encrypted communication with another network device by using the key; and an intermediate server deployed between the key generation device and the network device. The intermediate server includes: a state monitoring unit configured to transmit a state monitoring request to the key generation device at each predetermined time; a notification unit configured to give a push notification of key information included in a response to the state monitoring request, to the network device, when the response is received; and a key exchange unit configured to start key exchange between the network device and the key generation device in response to a request from the network device having received the push notification of the key information.