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arXiv 2102.07528cs.DCcs.DS
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图的拜占庭色散

Byzantine Dispersion on Graphs

Anisur Rahaman Molla, Kaushik Mondal, William K. Moses

摘要:

本文考虑了拜占庭色散的问题,并沿着几个参数扩展了以前的工作。拜占庭分散的问题问:给定$n$机器人,其中$f$是拜占庭的,最初被任意放置在一个$n$节点匿名图,设计一个终止算法运行的机器人,使他们最终达到一个配置,每个节点上最多有一个非拜占庭robots.Previous工作解决了这个问题的戒指和容忍高达$n-1$拜占庭机器人。在本文中,我们研究更一般的图的问题。我们首先开发了一个算法,容忍高达$n-1$拜占庭机器人和工程图的更一般的类。然后,我们开发了一种算法,适用于任何图形,但容忍较少数量的拜占庭机器人。随后,我们将重点转向拜占庭机器人的力量。以前的工作只考虑了不能伪造身份证的“弱”拜占庭机器人。我们开发了一种算法,解决了拜占庭机器人不弱,可以伪造身份证时的问题。最后,我们研究了机器人数目不是$n$而是若干个$k$的情况。我们表明,在这样的情况下,拜占庭机器人,可以容忍的数量是严格限制的。具体来说,我们表明,它是不可能确定性地解决拜占庭色散时,$\lceil k/n \rceil > \lceil (k-f)/n \rceil$。

英文摘要:

This paper considers the problem of Byzantine dispersion and extends previous work along several parameters. The problem of Byzantine dispersion asks: given $n$ robots, up to $f$ of which are Byzantine, initially placed arbitrarily on an $n$ node anonymous graph, design a terminating algorithm to be run by the robots such that they eventually reach a configuration where each node has at most one non-Byzantine robot on it. Previous work solved this problem for rings and tolerated up to $n-1$ Byzantine robots. In this paper, we investigate the problem on more general graphs. We first develop an algorithm that tolerates up to $n-1$ Byzantine robots and works for a more general class of graphs. We then develop an algorithm that works for any graph but tolerates a lesser number of Byzantine robots. We subsequently turn our focus to the strength of the Byzantine robots. Previous work considers only ``weak" Byzantine robots that cannot fake their IDs. We develop an algorithm that solves the problem when Byzantine robots are not weak and can fake IDs. Finally, we study the situation where the number of the robots is not $n$ but some $k$. We show that in such a scenario, the number of Byzantine robots that can be tolerated is severely restricted. Specifically, we show that it is impossible to deterministically solve Byzantine dispersion when $\lceil k/n \rceil > \lceil (k-f)/n \rceil$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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