On the security of an enhanced signature scheme
Miaomiao Tian, Liusheng Huang, Wei Yang · International Journal of Information and Communication Technology · 2013
Currently, short signature is receiving significant attention since it is particularly useful in low-bandwidth communication environments. However, most of the short signature schemes are only based on one intractable assumption. Recently, Su presented an enhanced short signature scheme based on knapsack and bilinear pairing. He claimed that the signature scheme is secure in the random oracle model. Unfortunately, in this paper, we show that his scheme is insecure. Concretely, an adversary can forge a valid signature on any message with respect to any user’s identity in Su’s scheme.