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chapter
While many two-party fair exchange protocols have been proposed, more than three-party fair exchange protocol is required depending on a type of applications. Asokan et al. have proposed a multi-party fair exchange protocol for mesh topology. This scheme can be adapted to all kinds of topologies but requires much communication costs, which is 4n(n-1) passes in the all n-participators honest cases...
article
IET Information Security > 2015 > 9 > 3 > 185 - 193
Waters proposed the first efficient signature scheme that is known to be existentially unforgeable based on the standard computational Diffie-Hellman assumption without random oracles. Lu et al. then proposed the first verifiably encrypted signature (VES) scheme based on Waters signatures. However, the security proofs of Lu et al. and some other VES schemes are built on the certified-key model, in...
chapter
First we revisit three (BGLS, MBGLS and GZZ) verifiably encrypted signature schemes. We find that they are all not strong unforgeable. We remark that the notion of existential unforgeable is not sufficient for fair exchange protocols in most circumstances. So we propose three new (NBGLS, MBGLS and NGZZ) verifiably encrypted signature schemes which are strong unforgeable. Also we reconsider other two...
