Cryptanalysis of threshold group signature schemes with privilege subsets
Wang Ji-chuan · Computer Engineering and Applications Journal · 2010
Feng Deng-guo suggests a problem called threshold group signature scheme with privilege.In 2005,Chen Wei-dong presented a group of threshold group signature schemes with privilege subsets.Through cryptanalysis of it,KAC or KAC with others can froge signature,and it is not provided with distinguishability and traceability.Furthermore,it can not resist conspiratorial attack.An improved scheme is proposed and the security drawbacks of original scheme are overcome.In the new scheme,the interests of signer are protected and storage space is reduced,so it is more secure and efficient.