Abstract-In day-to-day communications we may need to establish temporary (ad hoc) connections anytime, anywhere. Data transfer through this ad hoc wireless network is required when it is hard to establish the large infrastructure. In MANETs there are many challenges in terms of deploying security especially when the confidentiality of the data is compromised. If the data is highly confidential, then providing security especially in the malicious environment is really a challenging task. Many researchers have however proposed solutions for internal as well as external attacks. But unfortunately everyone has some tradeoffs. Some methods are designed only for specific attacks. Some provide solutions for many attacks but depend on the factors like delay, high resource utilization etc. In this paper, we have in sighted into various security providing techniques that have cumulated from many years. We have attempted to present the current approaches for developing secured systems. These methods have used simple techniques to enhance the security and to reduce the complexity. There are many surveys done before on the security issues and methods. However to our information no one has surveyed the current emerging secured methods which may be more effective than the mostly used ones.
This paper discusses the link stability estimation for Mobile Ad hoc Networks (MANETs). In this approach the total time for which the link remains connected with the neighboring nodes is estimated. This helps to predict the stability of the route which is required to forward the packets to the destination. This method does not use the selection of the next hop on the basis of shortest distance, but is based on the time period for which the next hop link remains connected. The parameters we use, are the distance and frequency and signal quality. These provide the way for a node to decide the best next hop neighbor and hence a perfect Quality of Service (QoS) is also obtained.
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