An Id-based Group Blind Signature Scheme

The rapid development of computer technology has produced an irreversible effect on life habits and ways of working.Many activities which needed to spend a lot of time and energy to complete before can be implemented easily through the network.Such change has brought convenience to people’s life on a large scale. However, it causes great potential safety hazard at the same time, thus people’s requirement of information security has reached unprecedented heights.The digital signature technology is the inevitable outcome in order to adapt to people’s needs of information society. Many good characteristics of digital signature make it widely used in many fields, especially playing an important role in the field of electronic commerce and electronic government affairs. So digital signature technology, especially those schemes with special properties, and satisfying the special requirements draws great attention of scholars both at home and abroad. Research on digital signatures enters a milestone stage,which is not only a theoretical innovation, but also has far-reaching practical significance.When people put forward higher requirements in key management and security, the digital signature which is based on identity has more advantages than the traditional digital signature.With the rapid development of communication technology and computer network, the ordinary digital signature cannot meet the needs of the rapid development of information society. So intensifying research for Some special properties, can meet the special requirements of digital signature is extremely urgent. Among them two kinds of typical special signature is group signature and blind signature, at present, the study of these two kinds of special signature has achieved fruitful results, but there are still some defects and other problems. In order to solve these problems, scholars both at home and abroad has made a more in-depth study. They designed a group of blind signature scheme based on group signature scheme with blind signature characteristics.Group blind signature has all the advantages and properties of both group and blind signature.So in contrast group blind signature is more effective and more practical.The application of group blind signature is becoming wider and wider.This paper first introduces the digital signature scheme based on identity of Paterson, which is the theoretical basis for this article. Then mainly introduces a blind signature scheme based on identity. And on this basis, advancing a new group blind signature scheme based on identity.The security analysis of the project proves that the new group blind signature scheme is much more effective than original digital signature scheme based on identity, at the same time, the security can be ensured. The superiority of this scheme lies in the group of administrators and other members of the group based on the status compared with the previous group signature scheme, but also joined certain blindness. Group members can join in and cancel easily, with traceability.The length of group public key has nothing to do with the number of group members, so compared with the existing group signature scheme,it is more effective and more practical.