(t,n) Threshold Signature Scheme Withstanding the Conspiracy Attack

In order to overcome the security defect of the existing threshold signature scheme,a threshold signature scheme withstanding the conspiracy attack is proposed.Analysis shows that this scheme can not only resist conspiracy attacks essentially,but also provide anonymity and traceability simultaneously.In addition,a conspiracy attack is designed in this paper,which is adopted to test the current schemes and the scheme presented.The result shows that current schemes can not ensure the signature security,however,the proposed scheme can cope with this attack effectively.