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1. (WO2017061024) SECRET RETRIEVAL SYSTEM, MANAGEMENT DEVICE, SECRET RETRIEVAL METHOD, AND SECRET RETRIEVAL PROGRAM

Pub. No.:    WO/2017/061024    International Application No.:    PCT/JP2015/078712
Publication Date: Fri Apr 14 01:59:59 CEST 2017 International Filing Date: Sat Oct 10 01:59:59 CEST 2015
IPC: G09C 1/00
G06F 17/30
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: HIRANO, Takato
平野 貴人
KAWAI, Yutaka
川合 豊
Title: SECRET RETRIEVAL SYSTEM, MANAGEMENT DEVICE, SECRET RETRIEVAL METHOD, AND SECRET RETRIEVAL PROGRAM
Abstract:
A secret retrieval system comprises: an encryption similarity calculation unit (504) that calculates encryption similarity (5041) in which the similarity between storage data and retrieval data is encrypted using homomorphic encryption by performing homomorphic computations on storage encryption data (620) that is storage data encrypted using homomorphic encryption, and retrieval encryption data (720) that is retrieval data for retrieving the storage data and is retrieval data encrypted using homomorphic encryption; and an encryption result transmission unit (505) that generates an encryption retrieval result (5001) representing whether or not the similarity is within a threshold θ using the encryption similarity (5041) and transmits the encryption retrieval result to a retrieval device.