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SyMon: A practical approach to defend large structured P2P systems against Sybil Attack

机译：SyMon：针对大型结构化P2P系统防御Sybil攻击的实用方法

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摘要

Sybil attack is one of the most challenging problems that plague current decentralized Peer-to-Peer(P2P) systems. In Sybil attack, a single malicious user creates multiple peer identities known as sybils. These sybils are employed to target honest peers and hence subvert the system. In this paper, we describe a novel solution that enables all honest peers to protect themselves from sybils with high probability in large structured P2P systems. In our proposed sybil defense system, we associate every peer with another non-sybil peer known as SyMon. A given peer’s SyMon is chosen dynamically such that the chances of both of them being sybils are very low. The chosen SyMon is entrusted with the responsibility of moderating the transactions involving the given peer and hence makes it almost impossible for sybils to compromise the system. We show the effectiveness of our proposed system in defending against Sybil attack both analytically and experimentally. In addition to this, we explore the feasibility of our proposed solution in two P2P applications: reputation systems for P2P based file sharing applications and P2P applications susceptible to Denial-of-Service(DOS) attack, systems known to be highly vulnerable to Sybil attack. In each of our case studies, we discuss possible ways in which our solution can be employed to defend the system against Sybil attack.
机译：Sybil攻击是困扰当前分散式对等（P2P）系统的最具挑战性的问题之一。在Sybil攻击中，单个恶意用户会创建多个对等身份，称为sybil。这些符号被用来瞄准诚实的同伴，从而颠覆了系统。在本文中，我们描述了一种新颖的解决方案，该解决方案使所有诚实对等方都可以在大型结构化P2P系统中以很高的概率保护自己免受sybil的攻击。在我们提出的sybil防御系统中，我们将每个对等方与另一个称为SyMon的非sybil对等方相关联。动态选择给定对等体的SyMon，以使他们两个都成为sybil的机会非常低。选定的SyMon负责协调涉及给定对等方的事务，因此使sybil几乎不可能破坏系统。我们通过分析和实验证明了我们提出的系统在抵御Sybil攻击方面的有效性。除此之外，我们还在两个P2P应用程序中探索我们提出的解决方案的可行性：基于P2P的文件共享应用程序的信誉系统和容易受到拒绝服务（DOS）攻击的P2P应用程序，这些系统极易遭受Sybil攻击。在我们的每个案例研究中，我们都讨论了可以采用何种解决方案来防御Sybil攻击的系统。

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