Verifiably Encrypted Signature Schemes and Its Applications with Multiple Adjudicators
Li Xiang · Jisuanji gongcheng · 2008
Verifiably encrypted signature is usually applied to the fair exchange protocol. However the trusted third party (TTP) is a bottleneck inthe fair exchange protocol with a TTP. This paper extends Boneh et al’s verifiably encrypted signature with single adjudicator to a multi-adjudicatorscheme. In this scheme, the adjudication can be shared among multiple adjudicators using verifiable secret sharing without trusted center. Based onthe proposed verifiably encrypted signature scheme, it designs a contract signing protocol with multiple adjudicators. So the risk that any playercolludes TTP can be reduced. In addition, the protocol can provide unforgeability, opacity, fairness and confidentiality. The scheme has lowercommunication cost due to short signature and aggregate signature.