Research And Application Of Group Signature And CA System In Online-Bidding

With the development of Network Technology, Network-based bidding system applications become more widely. Online-bidding system provides users with great benefits and convenience. However, due to the special nature of the bidding activity, special demands are made on the security of the system.Based on the research and analysis of typical group signature schemes, this paper proposes a new group signature scheme. Our scheme makes the improvement to ACJT2000 scheme, adds the "second signature" process and introduces a new role group signing server. A group member and the signature server has a part of signature key respectively, group members can only generate correct signatures with the assistance of signing server. Through the analysis of the nature of the new scheme, prove that the scheme meets the requirements of group signature, and is more suitable for practical applications. Then this paper analyzed the secure threat which the system faces base on the practical work flow of the E-bidding platform. In response to these security issues, we designed and implemented a CA system supporting group signature—GsCA. GsCA implements most of the functionality of CA and uses the new group signature scheme described in this paper to support group signature. System is designed to take full account of the key security and system scalability. The paper has defined the GsCA structure and the work processes in detail, gives the concrete implementation to key module.Finally this paper applied GsCA in online bidding system, and analyzed the security of bidding system with GsCA. Proved that as a security solution of bidding system, GsCA can solve the security issue present in the system.