SA-TCP: A Secure and Adaptive TCP for Wireless Ad Hoc Networks

In this paper, we propose a secure and adaptive transmission control protocol (SA-TCP) for wireless ad hoc networks that utilizes network layer information to detect various types of packet losses and adjusts the value of congestion window (CWND) dynamically according to the dynamic network conditions. SA-TCP operates normally to collect the samples of CWND and takes the mean from these samples to set for the future samples. It also adjusts the value of congestion window limit (CWL) according to the dynamic network environment. A low complexity identity-based public key cryptography has been integrated with SA-TCP to make it suitable in highly vulnerable wireless ad hoc networks. A secret session key is generated on-fly between source and destination nodes to secure the three-way handshaking process of SA-TCP. Simulation results are given to show that SA-TCP outperforms the popular New Reno and ATCP in terms of throughput in different network scenarios.

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