The location of the mobile nodes in the MANET IoT changes continuously that`s why the communication among them is difficult. The different devices or nodes in the Internet of Things (IoT) connect with each other over the internet or convey information to each other if they are immediately in range. The existence of an attacker is a difficult issue in a network since it lowers routing performance and has an impact on node battery life. Secure routing is critical to the adoption and deployment of many IoT applications. Sybil attacks may be destructive to MANET IoT and constitute a significant problem for building effective IoT security solutions. In this dissertation, proposes the Hybrid trust based enhanced security technique to protect the MANET IoT network against Sybil Attack. The preceding Sec Trust method is recommended as a dependable approach in IoT to safeguard communication from Sybil attack. The proposed system also decreases energy usage, which increases network life time. The performance of both the schemes is measured in different node density situations, but Hybrid trust performs better. The Sec trust system is dependable and secure, but it is inefficient in routing between the source and destination. The efficient routing technique decreases network overhead, which reduces packet flooding and, as a result, improves routing efficiency. The Hybrid trust method enhances routing reliability by consuming the energy consumption of mobile nodes in an MANET IoT network.

IoT-MANET, Nodes, Hybrid Trust, Sec trust, Routing, Sybil Attacker

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