COMMUNICATION DEVICE, SERVER DEVICE, SECRET COMMUNICATION SYSTEM, METHOD THEREOF, AND PROGRAM

Title:

COMMUNICATION DEVICE, SERVER DEVICE, SECRET COMMUNICATION SYSTEM, METHOD THEREOF, AND PROGRAM

Document Type and Number:

WIPO Patent Application WO/2019/142824

Kind Code:

A1

Abstract:

This communication device is provided with a signature encryption unit which, when the communication device belongs to a group, uses a secret key to encrypt inputted information and transmits this to a server device, and a signature decoding unit which, if the communication device belongs to a group, downloads, from the server device, information of n-1 encrypted pieces of inputted information from other communication devices, and uses the secret key to decode the encrypted n-1 pieces of inputted information. The communication device transmits session key generation information to the server device via the signature encryption unit, generates a session key using n-1 pieces of session key generation information acquired via the signature decoding unit and session key generation information of the communication device, transmits to the server device, via the signature encryption unit, an encrypted text encrypted using the session key, and uses the session key to decode the n-1 encrypted texts acquired via the signature decoding unit.

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Inventors:

KOBAYASHI TETSUTARO (JP)
KAWAHARA YUTO (JP)
FUJI HITOSHI (JP)
YOSHIDA REO (JP)
YONEYAMA KAZUKI (JP)

Application Number:

PCT/JP2019/001097

Publication Date:

July 25, 2019

Filing Date:

January 16, 2019

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Assignee:

NIPPON TELEGRAPH & TELEPHONE (JP)

International Classes:

H04L9/14; H04L9/08; H04L9/32

Foreign References:

JP2004229105A	2004-08-12
JP2005159912A	2005-06-16

Other References:

SAJURAI ET AL: "A Charging Method without Disclosing Channel Informatio", TRANSACTIONS OF THE INFORMATION PROCESSING SOCIETY OF JAPAN, vol. 48, no. 9, 15 September 2007 (2007-09-15), pages 3219 - 3227
KOBAYASHI ET AL: "A proposal on Secure Communication Method Using Secret Sharing Schemes over MANET", IEEC WORING GROUP MATERIALS, no. CMN-15-011, 11 June 2015 (2015-06-11), pages 25 - 29

Attorney, Agent or Firm:

NAKAO, Naoki et al. (JP)

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