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Security in any of the networks became an important issue in this paper wehave implemented a security mechanism on Medium Access Control layer by AssuredNeighbor based Security Protocol to provide authentication and confidentialityof packets along with High speed transmission for Ad hoc networks. Here we havedivided the protocol into two different parts. The first part deals withRouting layer information; in this part we have tried to implement a possiblestrategy for detecting and isolating the malicious nodes. A trust counter foreach node is determined which can be actively increased and decreased dependingupon the trust value for the purpose of forwarding the packets from source nodeto destination node with the help of intermediate nodes. A threshold level isalso predetermined to detect the malicious nodes. If the value of the node intrust counter is less than the threshold value then the node is denoted'malicious'. The second part of our protocol deals with the security in thelink layer. For this security reason we have used CTR (Counter) approach forauthentication and encryption. We have simulated all our strategies and schemesin NS-2, the result of which gives a conclusion that our proposed protocol i.e.Assured Neighbor based Security Protocol can perform high packet deliveryagainst various intruders and also packet delivery ratio against mobility withlow delays and low overheads.

An Approach to Provide Security in Mobile Ad-Hoc Networks Using Counter Mode of Encryption on Mac Layer