Title:
A commitment method, a commitment system, a sender device, a receiving person device, and a program
Document Type and Number:
Japanese Patent JP6180375
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a technology for commitment that has excellent efficiency, is capable of proving safety on the basis of weak assumptions, and satisfies CCA safety.SOLUTION: A first commitment transmission unit 22 creates a first commitment by using a commitment method CCACom. A secret dispersion unit 13 creates a share by performing secret dispersion on a value ν. A second commitment transmission unit 14 creates a second commitment by calculating c:=Com(s,d). A third commitment transmission unit 15 creates a third commitment by using a commitment method CECom. A first open transmission unit 25 opens the first commitment. A third open transmission unit 17 opens all of the third commitment. A commitment verification unit 27 confirms establishment of c=Com(s,d). A value disclosure unit 31 transmits the value ν to a receiver device 2. A second open transmission unit 32 opens the second commitment. A share setting unit 42 creates a share. A value verification unit 43 determines whether or not to accept opening of the value ν.
Inventors:
Kiyoshima Sho
Application Number:
JP2014126865A
Publication Date:
August 16, 2017
Filing Date:
June 20, 2014
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04L9/32; G09C1/00
Foreign References:
| WO2012011564A1 |
Other References:
KIYOSHIMA, S.,et al.,"Constant-Round Black-Box Construction of Composable Multi-Party Computation Protocol",2013年12月 6日,p.1-39,[online],[平成29年6月30日検索],インターネット,URL,https://eprint.iacr.org/2013/811
清島奨ほか,On Concurrently Extractable Commitment Schemes,2014年 暗号と情報セキュリティシンポジウム SCIS2014,日本,一般社団法人電子情報通信学会情報,2014年 2月21日,p.1-8
清島奨ほか,On the Round-Complexity Lower Bound of CCA-Secure Commitments,2013年 暗号と情報セキュリティシンポジウム SCIS2013,日本,一般社団法人電子情報通信学会,2013年 1月22日,p.1-6
清島奨ほか,On Concurrently Extractable Commitment Schemes,2014年 暗号と情報セキュリティシンポジウム SCIS2014,日本,一般社団法人電子情報通信学会情報,2014年 2月21日,p.1-8
清島奨ほか,On the Round-Complexity Lower Bound of CCA-Secure Commitments,2013年 暗号と情報セキュリティシンポジウム SCIS2013,日本,一般社団法人電子情報通信学会,2013年 1月22日,p.1-6
Attorney, Agent or Firm:
Naoki Nakao
Yukio Nakamura
Yoshimura Munehiro
Yukio Nakamura
Yoshimura Munehiro