Title:
CRYPTOSYSTEM, FUNCTION VALUE CALCULATION METHOD AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/009860
Kind Code:
A1
Abstract:
Provided is a cryptosystem that controls inputs to a function on a data-by-data basis, while suppressing cost of communication from a key issuing agency to a user. The cryptosystem comprises an encryption device, a signature device and a security execution device. The encryption device generates a different pseudo random number data by data, and encrypts the generated pseudo random number together with the data. The signature device reproduces the pseudo random number used by the encryption device for encrypting each data and generates, from the reproduced pseudo random number, control information for verifying the correctness of the data. The security execution device verifies the control information on the basis of the pseudo random number obtained by decrypting the encrypted text of the data, and, in a case of successful verification of the control information, then calculates a function value of the data obtained by decrypting the encrypted text.
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Inventors:
TAMIYA HIROTO (JP)
ISSHIKI TOSHIYUKI (JP)
ENKHTAIVAN BATNYAM (JP)
ISSHIKI TOSHIYUKI (JP)
ENKHTAIVAN BATNYAM (JP)
Application Number:
PCT/JP2019/027996
Publication Date:
January 21, 2021
Filing Date:
July 17, 2019
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04L9/32; G09C1/00
Other References:
SHINJI YOSHINO; MASAYUKI TEZUKA; KAZUMASA SHINAGAWA; KEISUKE TANAKA: "Multi-input functional encryption that can control input using Intel SGX", PREPRINTS OF 2019 SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY; JANUARY 22-25, 2019, 15 January 2019 (2019-01-15), pages 1 - 8, XP009526319
RYUYA UDA; YUTAKA MATSUSHITA: "Voice Stream Authentication Method for IP Telephony", IPSJ JOURNAL, vol. 47, no. 8, 15 August 2006 (2006-08-15), pages 2535 - 2547, XP009526302, ISSN: 0387-5806
RYUYA UDA; YUTAKA MATSUSHITA: "Voice Stream Authentication Method for IP Telephony", IPSJ JOURNAL, vol. 47, no. 8, 15 August 2006 (2006-08-15), pages 2535 - 2547, XP009526302, ISSN: 0387-5806
Attorney, Agent or Firm:
KAJITA, Kuniyuki et al. (JP)
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