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1. (WO2018047698) ENCODED MESSAGE RETRIEVAL METHOD, MESSAGE TRANSMISSION/RECEPTION SYSTEM, SERVER, TERMINAL, AND PROGRAM

Pub. No.:    WO/2018/047698    International Application No.:    PCT/JP2017/031195
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Thu Aug 31 01:59:59 CEST 2017
IPC: G06F 17/30
G09C 1/00
H04L 9/08
H04L 9/16
Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
日本電信電話株式会社
Inventors: OKANO, Yuki
岡野 裕樹
YOSHIDA, Reo
吉田 麗生
NISHIMAKI, Ryo
西巻 陵
KOBAYASHI, Tetsutaro
小林 鉄太郎
Title: ENCODED MESSAGE RETRIEVAL METHOD, MESSAGE TRANSMISSION/RECEPTION SYSTEM, SERVER, TERMINAL, AND PROGRAM
Abstract:
Provided is an encoded message retrieval technology with which the retrieval content and the retrieval result is not easily inferred when a message is retrieved while still encoded. An encoded message retrieval method includes: an encoded retrieval-use private key transmission step in which an encoded retrieval-use private key is generated from a retrieval-use private key every time an update interval set in advance from a terminal elapses, and the encoded retrieval-use private key is transmitted to a server; a retrieval-use private key decoding step in which the terminal decodes a retrieval-use private key from an encoded retrieval-use private key obtained from the server; an encoded message transmission step in which the terminal transmits information related to a message, an index set generated using the newest retrieval-use private key, and an encoded message to the server; a query transmission step in which the terminal transmits to the server a query set generated using a message retrieval-use character string and the retrieval-use private key; and an encoded message response step in which the server transmits to the terminal an encoded message having index set elements matching the elements of the query set.