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1. 发明授权

EP3309995B1 KEY EXCHANGE METHOD, KEY EXCHANGE SYSTEM, KEY DISTRIBUTION DEVICE, COMMUNICATION DEVICE, AND PROGRAM 有权
公开(公告)号：EP3309995B1
公开(公告)日：2020-02-19
申请号：EP16807214.8
申请日：2016-04-21
申请人： Nippon Telegraph And Telephone Corporation
发明人： YOSHIDA, Reo , FUJI, Hitoshi , KOBAYASHI, Tetsutaro , YAMAMOTO, Tomohide , KAWAHARA, Yuto , YONEYAMA, Kazuki
IPC分类号： H04L9/08 , H04L9/32

2. 发明公开

EP3681096A1 ANONYMOUS BROADCAST METHOD, KEY EXCHANGE METHOD, ANONYMOUS BROADCAST SYSTEM, KEY EXCHANGE SYSTEM, COMMUNICATION DEVICE, AND PROGRAM 审中-公开
公开(公告)号：EP3681096A1
公开(公告)日：2020-07-15
申请号：EP18853661.9
申请日：2018-08-14
申请人： Nippon Telegraph And Telephone Corporation
发明人： YOSHIDA, Reo , KOBAYASHI, Tetsutaro , KAWAHARA, Yuto , FUJI, Hitoshi , YONEYAMA, Kazuki
IPC分类号： H04L9/08 , H04L9/32
摘要： A key exchange technique of performing a key exchange among N (≥ 2) parties, which can conceal metadata on communication, is provided. A key exchange method includes: a first key generation step in which a communication device U i generates a first key; a first anonymous broadcast step in which the communication device U i anonymously broadcasts the first key with a set R-{U i } being designated for i ∈ {1, ..., n} and the communication device U i anonymously broadcasts the first key with ϕ being designated for i ∈ {n+1, ..., N}; a second key generation step in which the communication device U i generates a second key; a second anonymous broadcast step in which the communication device U i anonymously broadcasts the second key with the set R-{U i } being designated for i ∈ {1, ..., n} and the communication device U i anonymously broadcasts the second key with ϕ being designated for i ∈ {n+1, ..., N}; and a session key generation step in which the communication device U i generates a session key SK for i ∈ {1, ..., n} if a predetermined condition is satisfied.

3. 发明公开

EP3709564A1 DATA SHARING METHOD, DATA SHARING SYSTEM, DATA SHARING SERVER, COMMUNICATION TERMINAL, AND PROGRAM 有权
公开(公告)号：EP3709564A1
公开(公告)日：2020-09-16
申请号：EP18874039.3
申请日：2018-11-05
申请人： Nippon Telegraph And Telephone Corporation
发明人： OKANO, Yuki , YOSHIDA, Reo , KAWAHARA, Yuto , KOBAYASHI, Tetsutaro
IPC分类号： H04L9/08 , H04L9/16
摘要： There is provided a data sharing technique in which it is possible to update data stored in a server before to such data that is decryptable on the communication terminal side using an updated session key without the data being decrypted on the server side, and a deleted user cannot decrypt the decryptable data. There are included: a generation identifier generation step of a data sharing server generating a generation identifier showing a generation of a group; a session key encryption step of a communication terminal to perform encrypted session key update using the generation identifier received from the data sharing server and a public parameter and a session key recorded in a recording part to generate an encrypted session key, which is a session key encrypted; and an encrypted session key management step of the data sharing server recording the encrypted session key received from the communication terminal to perform encrypted session key update as a currently valid encrypted session key.

4. 发明公开

EP3624393A1 KEY DISTRIBUTION SYSTEM AND METHOD, KEY GENERATION DEVICE, REPRESENTATIVE USER TERMINAL, SERVER DEVICE, USER TERMINAL AND PROGRAM 有权
公开(公告)号：EP3624393A1
公开(公告)日：2020-03-18
申请号：EP18798218.6
申请日：2018-04-27
申请人： Nippon Telegraph and Telephone Corporation
发明人： YOSHIDA, Reo , KOBAYASHI, Tetsutaro , KAWAHARA, Yuto , FUJI, Hitoshi , YONEYAMA, Kazuki
IPC分类号： H04L9/08
摘要： A key distribution system includes a representative user terminal 2 p , a server apparatus 3, and an (n+1)-th user terminal 2 n+1 . The representative user terminal 2 p uses a public key for the (n+1)-th user terminal 2 n+1 and information for identifying the (n+1)-th user terminal 2 n+1 to encrypt key information with a predetermined encryption function in Certificate-less Encryption to obtain ciphertext. The server apparatus 3 sends the ciphertext to the (n+1)-th user terminal 2 n+1 when the (n+1)-th user terminal 2 n+1 is added. The (n+1)-th user terminal 2 n+1 uses a complete secret key for the (n+1)-th user terminal 2 n+1 and the information for identifying the (n+1)-th user terminal 2 n+1 to decrypt the ciphertext with a predetermined decryption function to obtain the key information.

5. 发明授权

EP3291483B1 DATA TRANSMISSION AND RECEPTION METHOD AND SYSTEM 有权
公开(公告)号：EP3291483B1
公开(公告)日：2020-01-01
申请号：EP16786382.8
申请日：2016-04-20
申请人： Nippon Telegraph and Telephone Corporation
发明人： YOSHIDA, Reo , FUJI, Hitoshi , KOBAYASHI, Tetsutaro , YAMAMOTO, Tomohide , KAWAHARA, Yuto
IPC分类号： H04L9/16 , H04L9/08 , H04L29/06

6. 发明公开

EP3474486A1 TERMINAL DEVICE, KEY DISTRIBUTION MANAGEMENT DEVICE, SERVER-CLIENT SYSTEM, COMMUNICATION METHOD, AND PROGRAM 有权
公开(公告)号：EP3474486A1
公开(公告)日：2019-04-24
申请号：EP17815192.4
申请日：2017-06-08
申请人： Nippon Telegraph and Telephone Corporation
发明人： KAWAHARA, Yuto , FUJI, Hitoshi , KOBAYASHI, Tetsutaro , YOSHIDA, Reo , YAMAMOTO, Tomohide
IPC分类号： H04L9/08 , G06F21/44 , G06F21/60 , H04L9/32
摘要： To provide a terminal device that can share a session key for use in encryption communication with multiple terminal devices at a certain timing without relying on an existing server device. The terminal device includes: a list/request sending unit that, when the terminal device operates as an owner device, generates a key distribution request, signs the key distribution request, and transmits the key distribution request to a key distribution management device; a participation request sending unit that, when the terminal device operates as a general device, generates a participation request, signs the participation request, and transmits the participation request to the key distribution management device; a session key generating unit that executes an authentication-based multipoint key distribution algorithm of server-client type in cooperation with another terminal device participating in the session and with the key distribution management device to generate a session key; and a post-confirmation unit that, when the session key has been normally generated, transmits a success notice to the key distribution management device and receives a collective notice from the key distribution management device.

7. 发明公开

EP3309995A1 KEY EXCHANGE METHOD, KEY EXCHANGE SYSTEM, KEY DISTRIBUTION DEVICE, COMMUNICATION DEVICE, AND PROGRAM 有权
标题翻译：钥匙交换方法，钥匙交换系统，钥匙分配装置，通信装置和程序
公开(公告)号：EP3309995A1
公开(公告)日：2018-04-18
申请号：EP16807214.8
申请日：2016-04-21
申请人： Nippon Telegraph And Telephone Corporation
发明人： YOSHIDA, Reo , FUJI, Hitoshi , KOBAYASHI, Tetsutaro , YAMAMOTO, Tomohide , KAWAHARA, Yuto , YONEYAMA, Kazuki
IPC分类号： H04L9/08 , H04L9/32
CPC分类号： H04L9/0833 , H04L9/08 , H04L9/0869 , H04L9/30 , H04L9/3236
摘要： Plurality of users share a common key while permitting dynamic member change and computational complexity required for key exchange is reduced. The first key generation unit 212 computes R i and c i based on a twisted pseudo-random function. A session ID generation unit 113 generates sid based on a target-collision resistant hash function and transmits (sid, R α , R β ) to communication devices U i . A second key generation unit 214 of a representative communication device U 1 computes T 1 based on a pseudo-random function. A second key generation unit 214 of general communication devices U j computes T j based on the pseudo-random function. A third key generation unit 115 computes k' based on the twisted pseudo-random function and computes T' j with respect to each j. A session key generation unit 217 of the general communication devices U j computes K j 1 and k 1 . The session key generation unit 217 generates a common key K 2 based on the pseudo-random function.
摘要翻译：多个用户共享一个共同密钥，同时允许动态成员改变并且减少了密钥交换所需的计算复杂度。第一密钥生成单元212基于扭曲的伪随机函数来计算Ri和ci。会话ID生成单元113基于抗目标碰撞散列函数生成sid，并向通信设备Ui发送（sid，Rα，Rβ）。代表性通信设备U1的第二密钥生成单元214基于伪随机函数来计算T1。一般通信设备Uj的第二密钥生成单元214基于伪随机函数来计算Tj。第三密钥生成单元115基于扭曲的伪随机函数计算k'并且针对每个j计算T'j。一般通信设备Uj的会话密钥生成单元217计算Kj1和k1。会话密钥生成单元217基于伪随机函数生成公共密钥K2。

8. 发明公开

EP3291483A1 DATA TRANSMITTING AND RECEIVING METHOD AND SYSTEM 有权
标题翻译：数据发送和接收方法和系统
公开(公告)号：EP3291483A1
公开(公告)日：2018-03-07
申请号：EP16786382.8
申请日：2016-04-20
申请人： Nippon Telegraph and Telephone Corporation
发明人： YOSHIDA, Reo , FUJI, Hitoshi , KOBAYASHI, Tetsutaro , YAMAMOTO, Tomohide , KAWAHARA, Yuto
IPC分类号： H04L9/16 , H04L9/08
摘要： A server sends a key update request for requesting updating of the key, to a client terminal. The client terminal sends, to a key delivery server, a key delivery request for requesting the delivery of a key to the client terminal. The key delivery server delivers a key to the client terminal. The client terminal sends, to the server, a key reception notice indicating that the delivered key was received. The server sends, to the client terminal, a key-use start notice indicating that the client terminal starts data transmission and reception by using the delivered key with a different client terminal from the aforementioned client terminal. The client terminal performs data transmission and reception with the different client terminal by using the delivered key.
摘要翻译：服务器向客户端发送用于请求更新密钥的密钥更新请求。客户终端向密钥递送服务器发送用于请求向客户终端递送密钥的密钥递送请求。密钥传送服务器将密钥传送给客户终端。客户终端向服务器发送一个密钥接收通知，表明已经接收到了所传送的密钥。服务器向客户终端发送指示客户终端通过使用与前述客户终端不同的客户终端使用所递送的密钥来开始数据发送和接收的密钥使用开始通知。客户终端通过使用所递送的密钥来执行与不同客户终端的数据发送和接收。

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