Forward-safe Group Signature Research

In this world, with the development of the network society, information security becomes a research hotspot. Internet security mainly relies on the cryptography techniques to achieve. Symmetric cryptography and public key cryptography is two important branch of cryptography, and the essential difference between the two is: symmetric cryptography required the same key and the public key cryptography required the different keys. Digital signature is a research branch of public key cryptography technology, as well as traditional handwritten signature, and digital signature can guarantee the information security and integrity. Along with the deepening of the research on digital signature, it was found that ordinary digital signature cannot better play to its actual needs in some special electronic commerce, electronic government activities, so digital signature has some characteristics to features of signature. Group signature is an anonymity and traceability of group signature, and it has a wide range of applications, such as for the issue of important military intelligence, the signed of financial contract, etc. In addition, the forward secure technology is to reduce the harm of a secret key from the protection technology in the public key system. To make both forward security and the nature of the group signature, this paper deeply discusses the issues of the forward secure group signature. Through the analysis of the existing forward secure group signature scheme, this paper found that the existing scheme still has the shortcoming of the following two aspects:(1)In real time and low bandwidth application, solutions limited.(2)The existing scheme has complex structure, the characteristics of the low efficiency.Based on the above problems, this paper gives a new forward secure group signature scheme based on identity. The structure of the scheme is bilinear mapping, which makes the scheme of calculation is relatively simple, efficient, and has all the security properties of group signature. Based on the identity of the group signature scheme in real time, low bandwidth applications are no longer limited. Using the forward security technology scheme becomes more and more safety. In addition, the scheme supports lazy update technology, has no fixed life cycle and simple structure.