Since WSNs are used in missionsecurity is an essential requirement. Sensor nodes can easily be compromised by an adversary due to unique constraints inherent in WSNs such as limited sensor node energy, limited computation and communication capabilities and the hostile deployment environments. These unique challenges render existing traditional security schemes used in traditional networks inadequate and inefficient. An adversary may take control of some sensor nodes and use them to inject false data with the aim of misleading the network's operator (Byzantine attack). It is therefore critical to detect and isolate malicious nodes so as to prevent attacks that can be launched from these nodes and more importantly avoid being misled by falsified information introduced by the adversary via them. This research gives emphasis on improving Weighted Trust Evaluation (WTE) as a technique for detecting and isolating the malicious nodes. Extensive simulation is performed using MAT LAB in which the results show the proposed WTE based algorithm has the ability to detect and isolate malic both the malicious sensor nodes and the malicious cluster heads (forwarding nodes) in WSNs at a reasonable detection rate and short response time whilst achieving good scalability.

Wireless Sensor Networks (WSNs) present myriad application opportunities for several applications such as precision agriculture, environmental and habitat monitoring, traffic control, industrial process monitoring and control, home automation and mission-critical surveillance applications such as military surveillance, healthcare (elderly, home monitoring) applications, disaster relief and management, fire detection applications among others. Since WSNs are used in missioncritical tasks, security is an essential requirement. Sensor nodes can easily be compromised by an adversary due to unique constraints inherent in WSNs such as limited sensor node energy, limited computation and communication capabilities and the hostile deployment environments.

virtualization is the creation of a virtual (rather than actual) version of something, such as a hardware platform, operating system (OS), storage device, or network resources. In a virtualized environment, computing environments can be produced in a forceful dynamic manner, enlarged, become smaller or go in a specified direction or manner as demand varies. Virtualization is therefore highly suitable to a dynamic cloud infrastructure, because it provides important advantages in isolation, manageability and sharing.

VANETs are anticipated to prop a colossal spectrum of mobile distributed applications whose scope is from traffic alert dissemination and dynamic route planning to context-aware advertisement and file sharing. The performance of established routing protocols in VANET is very deprived. The main problem with these protocols is their Route Instability in VANET's. The established node-centric view of the routes (i.e., an established path is a succession of nodes between the source and the destination) leads to frequent broken paths in the presence of VANETs' elevated mobility, Consequently, countless packets are dropped, and the overhead due to path repairs or failure notifications considerably increases, leading to low delivery ratios and elevated transmission delays.