Research And Application Of Anonymous Authentication Method Based On Group Signature

With the continuous development of Internet applications,anonymous identity authentication plays an important role in protecting user privacy.The anonymous authentication method by using cryptography has become one of the most important methods to protect personal privacy on the Internet.In many anonymous authentication methods by using cryptography,the anonymous authentication method based on group signature mechanism has become the hotspot in the current research.The anonymity,traceability,and flexible revocation of group signature satisfy the needs of protecting user privacy.In order to meet actual demands on the Internet,group signatures not only need the above basic security attributes,but also need to be able to achieve efficient and forward-security member revocation,while meet lower signature and verification costs.Although a number of group signature schemes have been proposed at present,the vast majority cannot meet the above requirements at the same time;in addition,the group signature schemes proposed at present have not yet satisfied forward security after group members revocation.Therefore,based on the related theoretical knowledge such as BBS+ signatures and complete sub-tree method,this paper proposes an efficient and revocable anonymous authentication scheme with forward security.This scheme is proved to be security under the random oracle model,and proves that it has forward-security anonymity,traceability,and non-frameability security properties.Compared with existing group signature schemes in terms of performance,indicating that the proposed scheme has constant-level signature and verification costs,and does not need to obtain the latest revocation list in the verification phase,is more practical than other schemes.For the privacy security and dynamically join and revoke of anonymous authentication protocols under the Vehicular Ad-hoc Network(VANET),based on the anonymous authentication scheme proposed above,a new anonymous authentication protocol for VANET was designed and proposed.Give a detailed scheme design,and conducted simulation tests and security comparisons on the proposed scheme.The results show that the proposed scheme has forward-security and is more efficient than other similar schemes.