Forward secure group blind signature scheme based on Chinese remainder theorem

Group blind signature is a kind of special signature combined group signature and blind signature,which meets all advantages of both group signature and blind signature.This paper proposed a forward secure group blind signature scheme,which adds the nature of forward security and blind signature on the basis of the group blind signature based on Chinese remainder theorem suggested by Li Xinshe.The analysis of security shows that the improved scheme has forward security nature and is secure against framing attack and with unforgeability and other security nature which group signature requires,at the same time,group member can signature without revealing any information about the message.