Analysis And Design Of Blind Multi-signature Schemes

Blind multi-signature combine the characteristics of multi-signature and blind signatures.When multiple users collaborate to sign the same message,they can't see the specific content of the message,which can protect the rights of the message owner.In the field of e-commerce and e-government.There are a wide range of applications.This paper studies the blind multi-signature scheme from the following two aspects:Firstly,an ID-based blind multi-signature scheme is constructed based on the Shim signature scheme.At the same time,a detailed security analysis and efficiency analysis are carried out on the scheme.It is pointed out that the scheme has short key length while satisfying blindness and unforgeability.Efficient features such as small traffic,can be well applied to low bandwidth and resource constrained network environments.Secondly,the cryptanalysis of the(t,n)threshold multi-proxy multi-blind signature scheme proposed by Tian Juanhong et al.reveals that the scheme can not resist the forgery attack.A new improved threshold multi-proxy blind multi-signature scheme is proposed.The analysis results show that the improved scheme satisfies the security features of unforgeability and blindness.