Anonymous authentication schemes, mostly based on the notion of group signatures, allow a group member to obtain membership from a server and gain access rights if the member can prove their authenticity to the verifi...Anonymous authentication schemes, mostly based on the notion of group signatures, allow a group member to obtain membership from a server and gain access rights if the member can prove their authenticity to the verifier. However, existing authentication schemes are impractical because they neglect to provide an exclusive verification of the blacklist. In addition, the schemes are unaware of malicious members who are involved in privilege transferring. In this paper, a novel membership authentication scheme providing detection of membership transfer and proof of membership exclusiveness to the blacklist is proposed.展开更多
How to find efficient and secure member- ship revocation algorithms is one of the most important issues standing in the way of real-world applications of group signatures. In this paper, the proof of knowledge of divi...How to find efficient and secure member- ship revocation algorithms is one of the most important issues standing in the way of real-world applications of group signatures. In this paper, the proof of knowledge of divisibility is given and a novel membership revocation method in ACJT group signature scheme is proposed： the group manager issues the product E of the public keys of current members in the group, when a group member wants to sign, he should not only proves that he has a membership certificate, but also proves that the public key in his certificate divides exactly the public key product E with zero knowledge. The proposed method is efficient since the group manager only needs one division and one exponentiation when a group member is deleted, while the signing and verifying procedure are independent of the number of current group members and excluded members, as well as the original group public key and membership certificates needn＇t be changed.展开更多
文摘Anonymous authentication schemes, mostly based on the notion of group signatures, allow a group member to obtain membership from a server and gain access rights if the member can prove their authenticity to the verifier. However, existing authentication schemes are impractical because they neglect to provide an exclusive verification of the blacklist. In addition, the schemes are unaware of malicious members who are involved in privilege transferring. In this paper, a novel membership authentication scheme providing detection of membership transfer and proof of membership exclusiveness to the blacklist is proposed.
基金supported in part by the National Nature Science Foundation of China under Grant No. 60473027
文摘How to find efficient and secure member- ship revocation algorithms is one of the most important issues standing in the way of real-world applications of group signatures. In this paper, the proof of knowledge of divisibility is given and a novel membership revocation method in ACJT group signature scheme is proposed： the group manager issues the product E of the public keys of current members in the group, when a group member wants to sign, he should not only proves that he has a membership certificate, but also proves that the public key in his certificate divides exactly the public key product E with zero knowledge. The proposed method is efficient since the group manager only needs one division and one exponentiation when a group member is deleted, while the signing and verifying procedure are independent of the number of current group members and excluded members, as well as the original group public key and membership certificates needn＇t be changed.
