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- ISHIDA Ai
- Department of Mathematical and Computing Sciences, Tokyo Institute of Technology National Institute of Advanced Industrial Science and Technology
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- EMURA Keita
- National Institute of Information and Communications Technology
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- HANAOKA Goichiro
- National Institute of Advanced Industrial Science and Technology
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- SAKAI Yusuke
- National Institute of Advanced Industrial Science and Technology
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- TANAKA Keisuke
- Department of Mathematical and Computing Sciences, Tokyo Institute of Technology
抄録
<p>Group signatures are a class of digital signatures with enhanced privacy. By using this type of signature, a user can sign a message on behalf of a specific group without revealing his identity, but in the case of a dispute, an authority can expose the identity of the signer. However, it is not always the case that we need to know the specific identity of a signature. In this paper, we propose the notion of deniable group signatures, where the authority can issue a proof showing that the specified user is NOT the signer of a signature, without revealing the actual signer. We point out that existing efficient non-interactive zero-knowledge proof systems cannot be straightforwardly applied to prove such a statement. We circumvent this problem by giving a fairly practical construction through extending the Groth group signature scheme (ASIACRYPT 2007). In particular, a denial proof in our scheme consists of 96 group elements, which is about twice the size of a signature in the Groth scheme. The proposed scheme is provably secure under the same assumptions as those of the Groth scheme.</p>
収録刊行物
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- IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E100.A (9), 1825-1837, 2017
一般社団法人 電子情報通信学会
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詳細情報 詳細情報について
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- CRID
- 1390282681288078464
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- NII論文ID
- 130006038287
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- ISSN
- 17451337
- 09168508
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
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- KAKEN
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- 抄録ライセンスフラグ
- 使用不可