On the security of an enhanced short signature scheme

Details On the security of an enhanced short signature scheme On the security of an enhanced short signature scheme

2012-01-12

arxiv.org/abs/1201.2504v2

Computer Science

Cryptography and Security

Scientific paper

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 identity-based 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 identity in Su's scheme.

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