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Title:
TERMINAL DEVICE, KEY DISTRIBUTION MANAGEMENT DEVICE, SERVER-CLIENT SYSTEM, COMMUNICATION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2017/221723
Kind Code:
A1
Abstract:
Provided is a terminal device capable of sharing a session key to be used for encrypted communication among a plurality of terminal devices at any timing without depending on an existing server device. The terminal device includes: a list request transmission unit for, when an own device operates as an owner device, generating a key distribution request, signing the key distribution request, and transmitting the key distribution request to a key distribution management device; a participation request transmission unit for, when the own device operates as a general device, generating a participation request, signing the participation request, and transmitting the participation request to the key distribution management device; a session key generation unit for generating a session key by executing a server-client authenticated multi-point key distribution algorithm in cooperation with other terminal devices participating in a session and the key distribution management device; and a post-check unit for, when the session key has been successfully generated, transmitting a success notification to the key distribution management device and receiving a global notification from the key distribution management device.

Inventors:
KAWAHARA YUTO (JP)
FUJI HITOSHI (JP)
KOBAYASHI TETSUTARO (JP)
YOSHIDA REO (JP)
YAMAMOTO TOMOHIDE (JP)
Application Number:
PCT/JP2017/021277
Publication Date:
December 28, 2017
Filing Date:
June 08, 2017
Export Citation:
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Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04L9/08; G06F21/44; G06F21/60; H04L9/32
Domestic Patent References:
WO2016199507A12016-12-15
Foreign References:
JP2000196583A2000-07-14
JP2007235348A2007-09-13
JP2004242210A2004-08-26
JP2004023237A2004-01-22
JP2016134826A2016-07-25
Other References:
See also references of EP 3474486A4
J. ROSENBERG, SIP: SESSION INITIATION PROTOCOL, 3 June 2016 (2016-06-03), Retrieved from the Internet
T. OKAMOTO; K. TAKASHIMA: "Fully Secure Functional Encryption with General Relations from the Decisional Linear Assumption", ADVANCES IN CRYPTOLOGY - CRYPTO 2010, LECTURE NOTES IN COMPUTER SCIENCE, vol. 6223/201, 2010, pages 191 - 208, XP047270461, DOI: doi:10.1007/978-3-642-14623-7_11
J. KATZ; A. SAHAI; B. WATERS: "Predicate encryption supporting disjunctions, polynomial equations, and inner products", EUROCRYPT, 2008, pages 146 - 162, XP047030435, DOI: doi:10.1007/978-3-540-78967-3_9
T. OKAMOTO; K. TAKASHIMA: "Hierarchical predicate encryption for inner-products", ASIACRYPT, 2009, pages 214 - 231
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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