Efficient CodeGuard mechanism against pollution attacks in interflow Network coding

The study of Network coding and the impact of data pollution attacks is done in wireless network . The main focus is on pollution attacks and defenses in interflow network coding systems. While most of the prior work is on detecting and filtering polluted packets in intraflow network coding systems. But we deal with an interflow coding systems. An additional goal is to identify and eliminate the attacker nodes quickly between 500-1sec of attack. The CodeGuard , a defense mechanism that combines proactive node attestation and reactive traceback identifies and eliminates the attacker nodes unequivocally. Analysis of CodeGuard proved that it is always able to identify and isolate at least one attacker node on every occurrence of a pollution attack. Experimental demonstration shows that Code Guard is able to identify attacker nodes quickly and restore system throughput to a high level, even in the presence of many attacker nodes, thus preserving the performance of the underlying interflow network coding system.