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On the Security of Online/Offline Signatures and Multisignatures from ACISP’06

2008; Springer Science+Business Media; Linguagem: Inglês

10.1007/978-3-540-89641-8_8

1611-3349

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi,

Advanced Authentication Protocols Security

Efficient authentication in routing protocols is one of the most important problems for security of ad hoc networks. In ACISP'06, Xu, Mu, and Susilo proposed an identity-based online/offline signature scheme for authentication in the AODV protocol and then transformed this scheme to an identity-based multisignature scheme which is suitable for the DSR protocol. In this paper, we show that their schemes cannot achieve the claimed security by demonstrating a forgery attack. In this attack, an adversary can forge a valid signature on any messages. Therefore, their signature schemes cannot guarantee the security of AODV and DSR protocols. We also show that their generic construction of identity-based multisignature from identity-based online/offline signature is not secure.