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    KEY-EXCHANGE METHOD, KEY-EXCHANGE SYSTEM, KEY DEVICE, TERMINAL DEVICE, AND PROGRAM
    1.
    发明公开
    KEY-EXCHANGE METHOD, KEY-EXCHANGE SYSTEM, KEY DEVICE, TERMINAL DEVICE, AND PROGRAM 审中-公开

    公开(公告)号：EP3232603A4

    公开(公告)日：2018-03-14

    申请号：EP16737330

    申请日：2016-01-12

    申请人： NIPPON TELEGRAPH & TELEPHONE

    发明人： NAGAI AKIRA ,  SAITO TSUNEKAZU ,  KOBAYASHI TETSUTARO

    IPC分类号： H04L9/08 ,  G09C1/00 ,  H04L9/30

    CPC分类号： H04L9/0844 ,  G09C1/00 ,  H04L9/0643 ,  H04L9/0819 ,  H04L9/0841 ,  H04L9/0869 ,  H04L9/0894 ,  H04L9/0897 ,  H04L9/14 ,  H04L9/3093 ,  H04L2209/046 ,  H04L2209/76

    摘要： A key device cannot calculate a common key and a client can confirm that processing has been performed correctly by a correct key device. A random number generating unit 12 generates random numbers s 1 , s 2 , s' 1 , and s' 2 . A public keys randomizing unit 13 generates first randomized public keys information obtained by randomizing public keys by using the random number s 1 and second randomized public keys information obtained by randomizing the public keys by using the random number s 2 . A proxy calculation unit 21 calculates a first commission result by using a secret key and calculates a second commission result by using the secret key. A verification unit 14 calculates a first verification value by using the random number s 2 , calculates a second verification value by using the random number s 1 , and verifies whether or not the first verification value and the second verification value coincide with each other. A common key calculation unit 15 calculates a common key by using the random numbers s' 1 and s' 2 if the first verification value and the second verification value coincide with each other.

    KEY DEVICE, KEY CLOUD SYSTEM, DECRYPTION METHOD, AND PROGRAM
    2.
    发明公开
    KEY DEVICE, KEY CLOUD SYSTEM, DECRYPTION METHOD, AND PROGRAM 审中-公开
    SCHLÜSSELVORRICHTUNG，SCHLÜSSEL-CLOUD-SYSTEM，ENTSCHLÜSSELUNGSVERFAHRENUND PROGRAMM

    公开(公告)号：EP3059898A4

    公开(公告)日：2017-06-07

    申请号：EP14854587

    申请日：2014-10-07

    申请人： NIPPON TELEGRAPH & TELEPHONE

    发明人： SAITO TSUNEKAZU ,  YAMAMOTO GO ,  KOBAYASHI TETSUTARO

    IPC分类号： H04L9/08

    CPC分类号： H04L9/3242 ,  H04L9/088 ,  H04L9/0894 ,  H04L63/0428 ,  H04L63/06 ,  H04L63/0876 ,  H04L67/1097

    摘要： Registered network-based identification corresponding to any of networks is stored in a key device 12. A terminal device 11 sends ciphertext and network-based identification to the key device 12, using a network. The key device 12 receives the sent ciphertext and network-based identification and outputs response information corresponding to a decrypted value of the ciphertext when the network-based identification corresponds to the registered network-based identification. The terminal device 11 obtains the decrypted value from the response information.

    摘要翻译： 对应于任何网络的注册的基于网络的标识被存储在密钥设备12中。终端设备11使用网络向密钥设备12发送密文和基于网络的标识。 密钥设备12接收发送的密文和基于网络的标识，并且当基于网络的标识对应于注册的基于网络的标识时，输出与密文的解密值对应的响应信息。 终端设备11从响应信息获得解密值。