For further details contact: N.RAJASEKARAN B.E M.S 9841091117,9840103301. IMPULSE TECHNOLOGIES, Old No 251, New No 304, 2nd Floor, Arcot road , Vadapalani , Chennai-26. www.impulse.net.in Email: ieeeprojects@yahoo.com/ imbpulse@gmail.com

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Beacons U to World of technology
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Pollution Attacks and Defenses in Wireless Interflow Network
Coding Systems
Abstract—
We study data pollution attacks in wireless interflow network coding
systems. Although several defenses for these attacks are known for intraflow
network coding systems, none of them are applicable to interflow coding systems.
We formulate a model for interflow network coding that encompasses all the
existing systems, and use it to analyze the impact of pollution attacks. Our analysis
shows that the effects of pollution attacks depend not only on the network
topology, but also on the location and strategy of the attacker nodes. We propose
CodeGuard, a reactive attestation-based defense mechanism that uses efficient bit-
level traceback and a novel cross-examination technique to unequivocally identify
attacker nodes. We analyze the security of CodeGuard and prove that it is always
able to identify and isolate at least one attacker node on every occurrence of a
pollution attack. We analyze the overhead of CodeGuard and show that the
storage, computation, and communication overhead are practical. We
experimentally demonstrate that CodeGuard is able to identify attacker nodes
quickly (within 500 ms) and restore system throughput to a high level, even in the
presence of many attackers, thus preserving the performance of the underlying
network coding system.
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