The Mason Test: A Defense Against Sybil
Attacks in Wireless Networks Without
Trusted Authorities

Abstract?The Mason Test: A Defense Against Sybil Attacks in Wireless Networks WithoutTrusted Authorities. Wireless networks are vulnerable to Sybil attacks, in which a malicious node poses as many identities in order to gain disproportionate in?uence. Many defenses based on spatial variability of wireless channels exist, but depend either on detailed, multi-tap channel estimation?something not exposed on commodity 802.11 devices?or valid RSSI observations from multiple trusted sources, e.g., corporate access points?something not directly available in ad hoc and elay-tolerant networks with potentially malicious neighbors. We extend these techniques to be practical for wireless ad hoc networks of commodity 802.11 devices. Speci?cally, we propose two ef?cient methods for separating the valid < Final Year Projects 2016 > observations of behaving nodes from those falsi?ed by malicious participants. Further, we note that prior signal print methods are easily defeated by mobile attackers and develop an appropriate challenge-response defense. Finally, we present the Mason test, the ?rst implementation of these techniques for ad hoc and delay-tolerant networks of commodity 802.11 devices. We illustrate its performance in several real-world scenarios.

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