NEW ID-BASED GROUP SIGNATURE FROM PAIRINGS  

作　　者：Chen Xiaofeng Zhang Fangguo Kwangjo Kim 

机构地区：[1]School of Information Science and Technology, Sun Yat-sen University, Guangzhou 510275, China [2]International Research Center for Information Security, Information and Communications University, Taejon, 305-714 Korea

出　　处：《Journal of Electronics(China)》2006年第6期892-900,共9页电子科学学刊（英文版）

基　　金：Supported by National Natural Science Foundation of China (No.60503006 and No.60403007) and Natural Science Foundation of Guangdong, China (No. 04205407).

摘　　要：We argue that traditional identity-based systems from pairings seem unsuitable for designing group signature schemes due to the problem of key escrow. In this paper we first propose new ID-based public key systems without trusted PKG (Private Key Generator) from bilinear pairings. In our new ID-based systems, if the dishonest PKG impersonates an honest user to communicate with others, the user can provide a proof of treachery of the PKG afterwards, which is similar to certificate-based systems. Therefore, our systems reach the Girault’s trusted level 3. We then propose a group signature scheme under the new ID-based systems, the security and performance of which rely on the new systems. The size of the group public key and the length of the signature are independent on the numbers of the group.We argue that traditional identity-based systems from pairings seem unsuitable for designing group signature schemes due to the problem of key escrow. In this paper we first propose new ID-based public key systems without trusted PKG （Private Key Generator） from bilinear pairings, In our new ID-based systems, if the dishonest PKG impersonates an honest user to communicate with others, the user can provide a proof of treachery of the PKG afterwards, which is similar to certificate-based systems. Therefore, our systems reach the Girault＇s trusted level 3. We then propose a group signature scheme under the new ID-based systems, the security and performance of which rely on the new systems. The size of the group public key and the length of the signature are independent on the numbers of the group.

关 键 词：Group signature Bilinear pairings Identity-based cryptography 

分 类 号：TN918[电子电信—通信与信息系统]