A Forward-Secure Signature With Backward-Secure Detection

This paper enhances the security of Abdalla and Reyzin's forward-secure signature scheme with backward-secure detection. In the proposed scheme, the authors embedded the hash-chain into the forward-secure signature scheme. It achieves not only forward-secure but also backward secure for the digital signature. The key exposures carries very serious problems, it is regarded a total break of the system. In order to avoid this undesirable situation, the goal of forward security is to protect against this kind of threat.