A Secure Threshold Proxy Signature Scheme

Abstract Aiming at the security and performance problems existed in most threshold proxy signature (TPS) schemes, this paper presents a new TPS scheme based on bilinear pairings. In this work, the security level of the proposed TPS scheme has been significantly enhanced by using improved short signatures and interactive secret-sharing. Our analysis indicates that the proposed scheme achieves the six accepted security properties that are required for a strong-secure TPS scheme. It can also resist a severe attack against TPS, i.e., original signer changing attack.