TO DETECT AND ISOLATE SELECTIVE PACKET DROP ATTACK IN OPPORTUNISTIC TYPES OF NETWORK?

Nodes in MANETs are mobile, so they can change their location according to their requirements. Hence no fixed infrastructure is present in this network. It has one Sub category also known as opportunistic network networks. All nodes work on store and carry Scheme in it. Opportunistic network has some security and privacy issues. Malicious node can easily trigger attacks on this network. In this paper, our main aim is to ensure privacy. In this work, a network architecture is proposed in which a node want to send a message to a destination and it doesn’t want to explore its identity as well as destination identity then it first communicate with stable node(trusted node) and get a virtual id for a period a time. Stable node act as special node, which contains information of every node of the cluster and authenticate the nodes who wishes to communicate and provide virtual id to that nodes. And also a session key is provided for encryption of message to the source and decryption key to the destination for maintaining the confidentiality of the message. This approach provides privacy to the user and reduces the packet loss by a selfish node. The graphs represent the change in packet loss and throughput of opportunistic network.