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An improvisation version of traditional wireless networks provide mobile ad hoc network (MANET), which is highly suitable for emergency needs. But, at the same time, due to its infrastructure less and resources limitation create many challenges in its performance. Mainly due to its dynamic behaviour it prones to high security concern, as the complete communication cycle depends on the independent nodes which voluntary join and leave. Several security studies reveal that trust management systems can be effective and attained low overhead. But, most of these studies used an automated decision algorithms based on some predefined trust scheme. This kind of scheme unable to distinguish the node intentional and unintentional errors at runtime, which impact the selected paths for the communication. So, it is very important to identify node behaviour and also provide node recovery scheme. In this paper, we propose a novel trust management system based on node behaviour predication algorithm to preserve high network stability and security for the reliable data delivery. The algorithm will predict and identify the node behaviour and distinguish between unintentional temporary errors and intentional malicious behaviour and compute a node overall trust. Experimental results show that, node behavior prediction and trust management system improvise the throughput ratio and network stability.

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The growth of distributed computer networks (DCN) is simple for the user to share information and computing capabilities with the host. User identification is an essential access control mechanism for the client-server networking architecture. The perception of single sign-on allows a legitimate user to access a different service provider on a DCN using a single session key. Recently, several user identification techniques being proposed for DCN. Unfortunately, the existing proposals cannot maintain user anonymity when the majority of probable attacks. In addition, the further time synchronization mechanism they use can result in widespread overhead costs. To overcome these shortcomings, we propose a novel authentication mechanism to prevent unauthorized service access for a mobile device in distributed networks. The mechanism implements methods to generate securely encrypted keys using RSA algorithm to validate the authentication of user login id and password.  Later, it implements a secure session key generation using DH algorithm which allows accessing the different services without repeating the authentication mechanism. An experimental evaluation was performed to measure execution time overhead for the registration process, an authentication process, session key generation process and Service Request Performance. The comparison results with existing authentication mechanism show an improvisation in all the measures.

No abstract