Abstract
Garay et alter [9] prove that for the multi-party contract signing with n participants, at least n rounds are necessary. To date, the best solution is Baum-Waidner’s scheme [6], with t+2 rounds (where t is the number of dishonest signatories, so with t=n–1, the number of rounds is n+1). Here, we propose an optimal solution with exactly n rounds. On the other hand, Pfitzmann et alter [10] state that “there is no asynchronous optimistic contract signing scheme with three messages in the optimistic case”. However, it seems that Ferrer et alter [7] invalidate the previous theorem with a counterexample, presenting an asynchronous protocol with only three messages. In this paper, we clarify this apparent contradiction.
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Ferrer-Gomila, J.L., Payeras-Capellà, M., Huguet-Rotger, L. (2004). Optimality in Asynchronous Contract Signing Protocols. In: Katsikas, S., Lopez, J., Pernul, G. (eds) Trust and Privacy in Digital Business. TrustBus 2004. Lecture Notes in Computer Science, vol 3184. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30079-3_21
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DOI: https://doi.org/10.1007/978-3-540-30079-3_21
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