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Traditional digital signatures usually are computationally expensive and offer no anonymity to signers. It is not very applicable to mobile commerce, where lots of resource-constrained portable devices are involved. In this paper, we first propose a novel hash chain, called multipath hash chain. Then, a new signature protocol, that combines multipath hash chain with server-supported signature technique,...
Privacy protection is particularly challenging in location based services (LBS). On one hand, service providers want to authenticate legitimate users. On the other hand, mobile users would prefer not to expose any information which enables anyone, including service providers, to get some clue regarding their whereabouts. To resolve this dilemma, we propose an anonymous authentication protocol to protect...
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