Title:
KEY GENERATION DEVICE, COMPUTER SYSTEM, AND STATISTICAL ENCRYPTION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/149686
Kind Code:
A1
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.
Inventors:
YOSHINO MASAYUKI (JP)
SATO HISAYOSHI (JP)
NAGANUMA KEN (JP)
SATO HISAYOSHI (JP)
NAGANUMA KEN (JP)
Application Number:
PCT/JP2016/056322
Publication Date:
September 08, 2017
Filing Date:
March 02, 2016
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
G09C1/00
Foreign References:
| JP2012165374A | 2012-08-30 | |||
| JP2011232727A | 2011-11-17 | |||
| JP5679018B2 | 2015-03-04 |
Other References:
CASTELLUCCIA, CLAUDE ET AL.: "Efficient Aggregation of encrypted data in Wireless Sensor Networks", THE SECOND ANNUAL INTERNATIONAL CONFERENCE ON MOBILE AND UBIQUITOUS SYSTEMS: NETWORKING AND SERVICES, 2005, pages 109 - 117, XP055017676
See also references of EP 3425613A4
See also references of EP 3425613A4
Attorney, Agent or Firm:
TODA Yuji (JP)
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