On the Security of a Forward-Backward Secure Signature Scheme

10.6633/IJNS.201505.17(3).09

Liang-Liang Wang；Ke-Fei Chen；Xian-Ping Mao；Yong-Tao Wang

Backward-secure detection ； cryptanalysis ； digital signatures ； forward-secure ； key exposure

International Journal of Network Security

17卷3期（2015 / 05 / 01）

307 - 310

英文

In a forward-secure signature scheme, a current exposed secret key can be used to obtain future secret keys which can lead to future signatures invalid. Lin et al. proposed a new method called backward-secure detection to construct forward-backward secure signature schemes to avoid this shortcoming. In this paper, we will show an attack to point out that their scheme doesn't satisfy backward security.