New authorized blind group signature scheme

This paper points out a insecurity problem,and constructs a new authorized blind group signature scheme with the characteristics of blind signature and group signature.In this scheme,signer can sign a signature only when he knows both a secret key of one group member and a secret certificate.The receiver can verify the validity of the signature but he can’t distinguish which signature signed it.When the dispute occurs,only the authority canopenthe group signature to distinguish where the signature comes from.This scheme has lower computation,higher safety,simpler structure and more applied value than Yan’s scheme.