Title:
A scrambling system which can be searched, and a method
Document Type and Number:
Japanese Patent JP6144992
Kind Code:
B2
Abstract:
In a searchable cipher system, the security of ciphertext, the optimization of the size of ciphertext and the optimization of the network traffic are not examined enough. A registration client deposits encrypted data acquired by compressing the size of a search tag created for a search by a stochastic encryption using a mask by a hash value and an output value of a homomorphic function in a server, a search client similarly stochastically encrypts a search keyword and transmits it to the management server as a search keyword acquired by encrypting only a part of the encrypted data, the search client requests the management server to search data to be searched without making the management server release a mask by random numbers of the encrypted data and the encrypted keyword, the search client detects a wrong search in a search result, and decrypts the search result.
Inventors:
Masayuki Yoshino
Naonori Sato
Naonori Sato
Application Number:
JP2013165187A
Publication Date:
June 07, 2017
Filing Date:
August 08, 2013
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G06F17/30; G09C1/00
Domestic Patent References:
| JP2012123614A |
Foreign References:
| WO2013080365A1 |
Attorney, Agent or Firm:
Aoritsu patent business corporation