Cryptanalysis of Tzeng-Tzeng Forward-Secure Signature Schemes
Hong Wang · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2006
In PKC'01, Tzeng et al. proposed two robust forward-secure signature schemes with proactive security: one is an efficient scheme, but it requires a manager; the other scheme is a new construction based on distributed multiplication procedures. In this paper, we point out their new distributed multiplication procedure is not secure, thus making the whole new construction insecure. Finally, we present an improved forward-secure signature scheme without a manager.