Abstract
In 1999, Bao et al. proposed [6] a multi-party fair exchange protocol of electronic items with an offline trusted third party. In this protocol, a coalition including the initiator of the exchange can succeed in excluding a group of parties without the consent of the remaining entities. We show that every participant must trust the initiator of the protocol for not becoming a passive conspirator. We propose a new protocol in which the participants only need to trust the trusted third party. Moreover, under certain circumstances, if there are participants excluded from the exchange, they can prove that a problem occurred to an external adjudicator.
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González-Deleito, N., Markowitch, O. (2002). An Optimistic Multi-party Fair Exchange Protocol with Reduced Trust Requirements. In: Kim, K. (eds) Information Security and Cryptology — ICISC 2001. ICISC 2001. Lecture Notes in Computer Science, vol 2288. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45861-1_20
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DOI: https://doi.org/10.1007/3-540-45861-1_20
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