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In this paper, an enhanced version of Address Resolution Protocol (ARP) is proposed to prevent ARP poisoning based Man-In-The-Middle (MITM) attacks in wired or wireless LAN environments. The proposed mechanism is based on the idea that when a node knows the correct MAC address for a given IP address, if it does not delete the mapping while the machine is alive, then MITM attack is not possible for that IP address. In order to prevent MITM attack even for a new IP address, the authors propose a new IP/MAC mapping conflict resolution mechanism based on computational puzzle and voting.
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