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An Efficient proxy ring signature Without Bilinear Pairing

Chinese Journal of Electronics 2019年第3期28卷 514-520页

作者： ZHANG Yingying ZENG Jiwen School of Science Chongqing University of Posts and Telecommunications School of Mathematical Sciences Xiamen University School of Mathematics Science Xinjiang Normal University

proxy ring signature is a proxy signature designed to protect the privacy of the proxy signer. In this paper, we propose a new proxy ring signature based on the Schnorr’s signature. Our scheme combines the idea of the Schnorr’s signature with the method of existing structure of proxy ring signature. In order to improve the performance, we eliminate the use of bilinear pairing operation. We only use the hash function in the signature verification phase. Because of above features, the proxy ring signature scheme we proposed is more efficient in computation. We also prove that our scheme is unforgeable against all kinds of adversaries in the random oracle model.

关键词： ring signature proxy signature proxy ring signature Random oracle

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A Trust Value Sharing Scheme in Heterogeneous Identity Federation Topologies

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Computers, Materials & Continua 2020年第11期65卷 1559-1570页

作者： Ning Liu Fan Yang Xi Xiong Yan Chang Shibin Zhang School of Cybersecurity Chengdu University of Information TechnologyChengduChina The School of Computer Science and Engineering Nanyang Technological UniversitySingapore

Recent developments in heterogeneous identity federation systems have heightened the need for the related trust management system.The trust management system evaluates,manages,and shares users’trust values.The service provider(SP)members of the federation system rely on users’trust values to determine which type and quality of service will be provided to the users.While identity federation systems have the potential to help federated users save time and energy and improve service experience,the benefits also come with significant privacy risks.So far,there has been little discussion about the privacy protection of users in heterogeneous identity federation systems.In this paper,we propose a trust value sharing scheme based on a proxy ring signature for the trust management system in heterogeneous identity federation topologies.The ring signature schemes can ensure the validity of the data and hide the original signer,thereby protecting privacy.Moreover,no group manager participating in the ring signature,which naturally matches with our decentralized heterogeneous identity federation topologies.The proxy signature can reduce the workload of the private key owner.The proposed scheme shortens the calculation time for verifying the signature and then reduces the overall time consumption in the process of trust sharing.Our studies prove that the proposed scheme is privacy-preserving,efficient,and effective.

关键词： Heterogeneous identity federation system proxy ring signature trust value sharing scheme

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