Presentation 2017-12-21
Blacklistable Anonymous Credential System with Reputation Using Accumulator
Takeshi Kanatani, Toru Nakanishi,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) Conventional anonymous authentication such as group signature has a problem that the ID administrator can specify the authorized user. As a solution to this problem, anonymous authentication using a blacklist has been proposed. In this method, the user is authenticated without the ID administrator by proving that the past own session IDs are not included in the blacklist. However, since it can only perform a simple evaluation of whether he / she is an illegal or not. If a bad activity is performed, it becomes an illegal user at once. This evaluation does not depend on its degree. Thus, we propose a reputation-based blacklistable anonymous authentication in this research. The user receives a score from the service provider or other users after the session for his / her activity. When scores in sessions of all users and session IDs of the authenticated user are given, newly constructed accumulator can show "only" the sum of scores of the user. Since each information is compressed in the accumulator, it can be verified efficiently. By incorporating this into the previous scheme, we propose a reputation-based blacklistable anonymous authentication. Additionally, the processing time of authentication is measured by a PC to show the practicality.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Anonymity / Anonymous Credential / Accumulator / Blacklist
Paper # ISEC2017-81,COMP2017-35
Date of Issue 2017-12-14 (ISEC, COMP)

Conference Information
Committee ISEC / COMP
Conference Date 2017/12/21(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Eikokuji Campus, Kochi University of Technology
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Kazuto Ogawa(NHK) / Hiro Ito(Univ. of Electro-Comm.)
Vice Chair Atsushi Fujioka(Kanagawa Univ.) / Shiho Moriai(NICT) / Yushi Uno(Osaka Pref. Univ.)
Secretary Atsushi Fujioka(Tohoku Univ.) / Shiho Moriai(Tokai Univ.) / Yushi Uno(Seikei Univ.)
Assistant Keita Emura(NICT) / Yuichi Komano(TOSHIBA) / Yuuji Suga(IIJ)

Paper Information
Registration To Technical Committee on Information Security / Technical Committee on Theoretical Foundations of Computing
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Blacklistable Anonymous Credential System with Reputation Using Accumulator
Sub Title (in English)
Keyword(1) Anonymity
Keyword(2) Anonymous Credential
Keyword(3) Accumulator
Keyword(4) Blacklist
1st Author's Name Takeshi Kanatani
1st Author's Affiliation Hiroshima University(Hiroshima Univ.)
2nd Author's Name Toru Nakanishi
2nd Author's Affiliation Hiroshima University(Hiroshima Univ.)
Date 2017-12-21
Paper # ISEC2017-81,COMP2017-35
Volume (vol) vol.117
Number (no) ISEC-369,COMP-370
Page pp.pp.59-65(ISEC), pp.59-65(COMP),
#Pages 7
Date of Issue 2017-12-14 (ISEC, COMP)