Title:
SECRET CALCULATION DEVICE, SECRET CALCULATION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/131667
Kind Code:
A1
Abstract:
Provided is a secret calculation device comprising a secret calculation unit that executes secret calculation to encrypted data in which plain text represented in a predetermined expression form for probability calculation is encrypted with a homomorphic encryption method, the secret calculation including processing of acquiring the sum and processing of acquiring the product. In acquisition of the sum as the sum of first encrypted data that is a first one of the encrypted data and second encrypted data that is a second one of the encrypted data, the secret calculation unit determines a value of each digit of a bit stream representing the sum to be either one of a corresponding digit value in the bit stream that is represented in the expression form and represents the first encrypted data and a corresponding digit value in the bit stream that is represented in the expression form and represents the second encrypted data.
Inventors:
UENO REI (JP)
HOMMA NAOFUMI (JP)
HOMMA NAOFUMI (JP)
Application Number:
PCT/JP2020/045643
Publication Date:
July 01, 2021
Filing Date:
December 08, 2020
Export Citation:
Assignee:
UNIV TOHOKU (JP)
International Classes:
G09C1/00
Foreign References:
| US20170134157A1 | 2017-05-11 | |||
| JP2019232752A | 2019-12-24 |
Other References:
MARTINS, P. ET AL.: "A Stochastic Number Representation for Fully Homomorphic Cryptograhy", PROCEEDINGS 2017 IEEE INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING SYSTEMS, 2017, pages 1 - 6, XP033257024, DOI: 10.1109/SiPS.2017.8109973
LIU, D.: "Practical Fully Homomorphic Encryption without Noise Reduction", CRYPTOLOGY EPRINT ARCHIVE, May 2015 (2015-05-01), pages 1 - 18, XP061018448, Retrieved from the Internet
ILARIA CHILLOTTINICOLAS GAMAMARIA GEORGIEVAMALIKA IZABACHENE: "TFHE: Fast Fully Homomorphic Encryption Over the Torus", JOURNAL OF CRYPTOLOGY, 25 April 2019 (2019-04-25)
See also references of EP 4083972A4
LIU, D.: "Practical Fully Homomorphic Encryption without Noise Reduction", CRYPTOLOGY EPRINT ARCHIVE, May 2015 (2015-05-01), pages 1 - 18, XP061018448, Retrieved from the Internet
ILARIA CHILLOTTINICOLAS GAMAMARIA GEORGIEVAMALIKA IZABACHENE: "TFHE: Fast Fully Homomorphic Encryption Over the Torus", JOURNAL OF CRYPTOLOGY, 25 April 2019 (2019-04-25)
See also references of EP 4083972A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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