199 1~ 1995 。 During this period, besides the definition given by Chaum and Van Heyst and four schemes to realize group signature, it is mainly the work of Chen and Pedersen. Chen and Peterson proposed several new group signature schemes, and for the first time proposed a group signature scheme that allowed the group to add new members. Kamenish also studied the generalized group signature.
1995~ 1997 。 After several years of understanding and understanding of the concept and significance of group signature, some cryptographers began to study group signature technology. In addition to the work of Chen and Peterson, there are also the work of Park and others. At present, the research on group signature is not very active, and some new group signature schemes are mainly proposed.
1997. Since 1997, camenish and stadler first proposed a group signature scheme suitable for large groups, the research on group signature has entered a very active period and achieved a lot of research results. These studies pay more attention to the security, efficiency and practicability of group signature, and also involve many research directions. The secure and efficient group signature scheme, the mutual conversion between group signature and ordinary digital signature, and the popularization of group signature are studied. Such as hierarchical multi-group signature, group blind signature, multi-group signature, sub-group signature and so on. And some application results have been achieved in e-commerce. Therefore, the research results of Kamenish and Stadhle have become a milestone in the development history of group signature.