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Paper Abstract and Keywords
Presentation 2018-07-25 09:55
Truly Efficient Robust Secret Sharing for the Real World
Yohei Watanabe (UEC), Kazuma Ohara (UEC/NEC), Mitsugu Iwamoto, Kazuo Ohta (UEC) ISEC2018-13 SITE2018-5 HWS2018-10 ICSS2018-16 EMM2018-12
Abstract (in Japanese) (See Japanese page) 
(in English) Robust secret sharing is secret sharing with the following robustness property: An original message can be recovered even if the (predetermined) number of shares are maliciously modified. At EUROCRYPT 2012, Cevallos, Fehr, Ostrovsky, and Rabani (CFOR) proposed a robust secret sharing scheme secure against maximal corruption, and estimated that $O(kappa + n)$ bits of a share size are required for the scheme, where $kappa$ is a security parameter and $n$ is the number of players. In this paper, we first unveil a flaw in the original security proof, and show how to fix it. Unfortunately, the fixed proof gives $O(kappa + n^2)$ bits of a share size, which is definitely larger than originally estimated. We then give a new proof by improving Cevallos et al.'s approach, and show that the CFOR scheme actually achieves $O(kappa +n)$ bits of a share size. Although a more efficient scheme exists in an asymptotic sense, the share size estimated in this paper is the most efficient among all existing schemes in the sense of concrete parameters, even if we consider a robust secret sharing scheme where billions of players participate.
Keyword (in Japanese) (See Japanese page) 
(in English) Robust secret sharing / Maximal corruption / Security analysis / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 151, ISEC2018-13, pp. 1-8, July 2018.
Paper # ISEC2018-13 
Date of Issue 2018-07-18 (ISEC, SITE, HWS, ICSS, EMM) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Download PDF ISEC2018-13 SITE2018-5 HWS2018-10 ICSS2018-16 EMM2018-12

Conference Information
Conference Date 2018-07-25 - 2018-07-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security, etc. 
Paper Information
Registration To ISEC 
Conference Code 2018-07-HWS-ISEC-SITE-ICSS-EMM-CSEC-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Truly Efficient Robust Secret Sharing for the Real World 
Sub Title (in English)  
Keyword(1) Robust secret sharing  
Keyword(2) Maximal corruption  
Keyword(3) Security analysis  
1st Author's Name Yohei Watanabe  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Kazuma Ohara  
2nd Author's Affiliation The University of Electro-Communications/NEC Corporation (UEC/NEC)
3rd Author's Name Mitsugu Iwamoto  
3rd Author's Affiliation The University of Electro-Communications (UEC)
4th Author's Name Kazuo Ohta  
4th Author's Affiliation The University of Electro-Communications (UEC)
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Date Time 2018-07-25 09:55:00 
Presentation Time 25 
Registration for ISEC 
Paper # IEICE-ISEC2018-13,IEICE-SITE2018-5,IEICE-HWS2018-10,IEICE-ICSS2018-16,IEICE-EMM2018-12 
Volume (vol) IEICE-118 
Number (no) no.151(ISEC), no.152(SITE), no.153(HWS), no.154(ICSS), no.155(EMM) 
Page pp.1-8 
#Pages IEICE-8 
Date of Issue IEICE-ISEC-2018-07-18,IEICE-SITE-2018-07-18,IEICE-HWS-2018-07-18,IEICE-ICSS-2018-07-18,IEICE-EMM-2018-07-18 

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