Abstract
Ensuring Quality of Service (QoS) and providing seamless connectivity are challenging in a mobile adhoc network. When Mobile Subscriber Station (MSS) moves between Access Service Network (ASNs), the authentication delay incurred during inter-ASN handover becomes a bottleneck. Pre-authentication of the MSSs at the target ASN (tASN) reduces the handover delay. Some existing pre-authentication schemes are prone to attacks. Modified EAP based Pre-authentication scheme using Improved ElGamal (MEPIE) proposed in this paper, modifies the existing Enhanced EAP based pre-Authentication scheme by using improved ElGamal digital signature and ElGamal encryption algorithm. To overcome the Denial of Service (DoS) and the replay attacks, MEPIE enhances ElGamal by using additional random variables. It outperforms the existing schemes in terms of Throughput, Packet Delivery Ratio (PDR), authentication delay, number of keys and Packet Loss Ratio (PLR) with negligible computation overhead.
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