Welcome to the resource topic for 2001/044
Title:
Optimistic Asynchronous Multi-Party Contract Signing with Reduced Number of Rounds
Authors: Birgit Baum-Waidner
Abstract:Optimistic asynchronous multi-party contract signing protocols have
received attention in recent years as a compromise between efficient
protocols and protocols avoiding a third party as a bottleneck of
security. ``Optimistic’’ roughly means: in case all participants are
honest and receive the messages from the other participants as
expected, the third party is not involved at all. The best solutions
known so far terminate within t+2 rounds in the optimistic case, for
any fixed set of n signatories and allowing up to t<n dishonest
signatories. The protocols presented here achieve a major improvement
compared to the state of the art: The number of rounds R is reduced
from O(t) to O(1) for all n \ge 2t+1, and for n < 2t+1, R
grows remarkably slowly compared with numbers of rounds in O(t): If
t \approx \frac{k}{k+1} n then R \approx 2k.
ePrint: https://eprint.iacr.org/2001/044
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