论文标题

在对抗环境中的弹性多维共识

Resilient Multi-Dimensional Consensus in Adversarial Environment

论文作者

Yan, Jiaqi, Li, Xiuxian, Mo, Yilin, Wen, Changyun

论文摘要

本文考虑了网络系统中的多维共识,其中某些代理可能是行为不良(或错误)。尽管这些行为不端的影响,但良性代理人的目标是达成协议,同时避免受到错误的人的严重影响。为此,本文首先考虑了一般的共识算法类别,其中每个良性代理都根据接收值计算一个“辅助点”,并将其状态移至这一点。关于这种通用形式,我们提出了达到溶解的共识的条件,并获得了指数收敛速率的下限。假设恶意药物的数量是上限的,则根据获得的条件进一步开发了两种特定的弹性共识算法。尤其是,基于Helly定理的第一个解决方案实现了由良性代理的初始状态形成的凸壳内的共识,在该状态下,可以通过线性编程有效地计算辅助点。另一方面,第二种算法是标准平均共识算法的“内置”安全保证,因为在没有错误的节点的情况下,其性能与标准的性能完全吻合,同时也抵抗了不良态度在对抗环境中不良态度的严重影响。最终提供了一些数值示例,以验证理论结果。

This paper considers the multi-dimensional consensus in networked systems, where some of the agents might be misbehaving (or faulty). Despite the influence of these misbehaviors, the benign agents aim to reach an agreement while avoiding being seriously influenced by the faulty ones. To this end, this paper first considers a general class of consensus algorithms, where each benign agent computes an "auxiliary point" based on the received values and moves its state toward this point. Concerning this generic form, we present conditions for achieving resilient consensus and obtain a lower bound on the exponential convergence rate. Assuming that the number of malicious agents is upper bounded, two specific resilient consensus algorithms are further developed based on the obtained conditions. Particularly, the first solution, based on Helly's Theorem, achieves the consensus within the convex hull formed by the benign agents' initial states, where the auxiliary point can be efficiently computed through linear programming. On the other hand, the second algorithm serves as a "built-in" security guarantee for standard average consensus algorithms, in the sense that its performance coincides exactly with that of the standard ones in the absence of faulty nodes while also resisting the serious influence of the misbehaving ones in adversarial environment. Some numerical examples are provided in the end to verify the theoretical results.

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