An Unbiased Global Coin Flipping Protocal on Synchronous Distributed Systems (Special lssue on Selected Papers from LA Synposium)

概要

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We present a distributed protocol for achicving totally unbiased global coin flipping in the presence of an adversary. We consider a synchronous system of n processors at most t of which may be corrupted and manipulated by a malicious adversary, and assume a complete network where every two processors are connected via a private channel. Our protocol is deterministic and assumes a very powerful adversary. Although the adversary cannot eavesdrop, it is computationally unbounded, capable of rushing and dynamic. This is the same model that is adopted in Yao's glohal coin flipping protocol, which we use as the base of our protocl. Our protocol tolerates almost n/3 processor failures and terminates in t+4 rounds. The resilience of our protocol is greatly improved from that of Yao's protocol at the slight expense of running time, which is only added just two rounds.
社団法人電子情報通信学会の論文
2001-01-01