Data sharing method, data sharing system, data sharing server, communication terminal and program

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11177949
APP PUB NO 20200374114A1
SERIAL NO

16638356

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

  • NIPPON TELEGRAPH AND TELEPHONE CORPORATION

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawahara, Yuto Musashino, JP 14 10
Kobayashi, Tetsutaro Musashino, JP 49 236
Okano, Yuki Musashino, JP 18 26
Yoshida, Reo Musashino, JP 26 32

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