Security flaws analysis of a confirmer threshold digital signature scheme

Confirmer digital signature protocol is a special digital signature scheme which needs the participation of signer,confirmer and verifier: Other people except signer can't do such conclusion.Document~([8]) is a new confirmer threshold digital signature protocol,which is a new combination of secret sharing thoughts and confirmer digital signature scheme.But the proposed new scheme didn't satisfy some demands of confirmer digital signature protocol,therefore security flaws do exist;specific analysis is shown in this paper,the shortage of design is pointed out,and demonstrates that the new protocol didn't realize the expected goal.