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1. (WO2017149686) KEY GENERATION DEVICE, COMPUTER SYSTEM, AND STATISTICAL ENCRYPTION METHOD

Pub. No.:    WO/2017/149686    International Application No.:    PCT/JP2016/056322
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Thu Mar 03 00:59:59 CET 2016
IPC: G09C 1/00
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: YOSHINO Masayuki
吉野 雅之
SATO Hisayoshi
佐藤 尚宜
NAGANUMA Ken
長沼 健
Title: KEY GENERATION DEVICE, COMPUTER SYSTEM, AND STATISTICAL ENCRYPTION METHOD
Abstract:
When data analysis is carried out on a trusted data server using the technology described in the Patent Document 1, each encrypted text needs to be decrypted in the server. That is, the problem is that each plaintext data is revealed to the server when the server calculates basic statistics. A key generation device according to the present invention transmits a sum of random numbers that are keys used when encrypting each of the plaintexts to the server as a key for decrypting a sum of ciphertext data, and decrypts the sum of ciphertext data using the key.