Title:
データ比較装置、データ比較システム、及びデータ比較方法
Document Type and Number:
Japanese Patent JP7186136
Kind Code:
B2
Abstract:
A data comparison device holds first encrypted data in which a first plaintext is encrypted, and second encrypted data in which a second plaintext is encrypted, in which for the first plaintext divided into a plurality of blocks, the first encrypted data is generated by executing encryption of each of the plurality of blocks and shuffling of the plurality of blocks, for the second plaintext divided into the plurality of blocks, the second encrypted data is generated by executing encryption of each of the plurality of blocks, in at least one of the first encrypted data and the second encrypted data, a plaintext value is embedded as a value indicating a magnitude comparison result, and the data comparison device compares blocks at the same position before shuffling of the first encrypted data and the second encrypted data based on the embedded value and determines a magnitude relationship between the first plaintext and the second plaintext.
Inventors:
Masayuki Yoshino
Takeshi Naganuma
Naoki Sato
Takeshi Naganuma
Naoki Sato
Application Number:
JP2019112859A
Publication Date:
December 08, 2022
Filing Date:
June 18, 2019
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G09C1/00
Foreign References:
| WO2015052957A1 | ||||
| US20160240108 | ||||
| US20050147246 | ||||
| US20190007390 |
Other References:
古川 潤,2012年 暗号と情報セキュリティシンポジウム予稿集,日本,電子情報通信学会,2012年01月30日,pp.1-7
Attorney, Agent or Firm:
Fujio Patent Attorneys Corporation
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