Research And Application Of Aggregate Signature And Ring Signature Technolog

The popularization of computer network promotes the sharing of data and brings convenience to people’s life.However,the frequent privacy leakage incidents have raised people’s concern,and the privacy protection field has been widely paid attention to.The signature scheme with privacy awareness is one of the important means to provide privacy protection for users in the network.Therefore,improving the anonymity of signature schemes is one of the important directions in the research of various digital signature technologies.This paper studies aggregation signature and ring signature technology to improve their anonymity and efficiency.Firstly,based on the property of elliptic curve group,a signer pseudonym generation method in the aggregate signature scheme is designed,and then a privacy-aware aggregate signature scheme is proposed.Secondly,based on the property of bilinear mapping,a batch verification method in ring signature scheme is designed,and then a traceable ring signature scheme with batch verification is proposed.Finally,the proposed privacy-aware aggregate signature scheme and traceable ring signature scheme with batch verification are applied to the data collection process of VANET,and a data collection system with privacy awareness is designed.Based on the signature scheme proposed in this paper,the system not only guarantees the anonymity and traceability of vehicles,but also improves the efficiency.(1)A privacy-aware aggregation signature scheme is proposed.In order to solve the problem of privacy leakage in aggregate signature,this paper firstly proposes a pseudonym generation mechanism for signers.Two trusted third parties jointly generate pseudonyms for signers,and then proposes an aggregate signature scheme with privacy awareness.In the scheme,the signer uses a pseudonym to sign the message,and the aggregator aggregates multiple nodes,thus effectively hiding the real identity of the signer.Experimental analysis shows that the signature scheme can ensure the efficiency of signature,but also realize the anonymity of the signer,effectively protect the identity privacy of the signer.(2)A traceable ring signature scheme with batch verification is proposed.A traceable ring signature scheme with batch verification is proposed to solve the problem of low verification efficiency in traceable ring signature schemes.Based on the property of bilinear mapping,a batch verification algorithm for traceable ring signature scheme is designed to improve the efficiency of traceable ring signature verification.The performance analysis shows that the scheme improves the efficiency of the traceable ring signature scheme on the condition that the signature is not forgerable and the signer is anonymous and traceable.(3)A privacy-aware data collection system in the VANET is designed.The proposed privacy-aware aggregate signature scheme and traceable ring signature scheme with batch verification are applied to the data collection process of the VANET.They are respectively used to provide vehicle pseudonym generation,signature,verification and tracking methods and roadside unit signature,verification and tracking methods,so as to design a data collection system with privacy awareness in the VANET.Solve the problem of vehicle identity privacy disclosure in the VANET.The system ensures the reliability,security and anonymity of vehicle data.