Lei Zhang, Qianhong Wu and Bo Qin Identity-based optimistic fair exchange in the standard model Security and Communication Networks 6
We propose a fair exchange protocol based on identity-based verifiably encrypted signatures. The protocol involves an offline trusted third party which is only required when one entity attempts to cheat or crashes. The underlining identity-based verifiably encrypted signature scheme is the first identity-based verifiably encrypted signature scheme provably secure against existential unforgeable under adaptive chosen message and identity attacks in the standard model.
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