Cluster based enhanced sybil attack detection in MANET through integration of RSSI and CRL

Fully self-controlled mobile ad hoc networks represent a complex system. Due to the broadcast nature of wireless channel, MANET has many security issues. Especially, Sybil Attack is a very serious threat to the MANET as it creates multiple virtual fake identities per entity, there by affecting the routing table. The multiple virtual identities are obtained by spoofing the victim's node or by creating an arbitrary node as there is no restriction to create an arbitrary node in MANET. In the existing system, author has used RSSI as a parameter to detect the Sybil node because of its lightweight but it has failed to detect the fast moving Sybil nodes. The proposed system works considering the Certification Authority as one parameter and RSSI as the other parameter. The RSSI is used to form the cluster and to elect the cluster head. The CA's responsibility is given to the CH. Whenever huge variations occur in RSSI on neighbour's entry and exit behaviour, the Certification Authority comes into play. The CA checks the certification of a node. If it is not valid, its certificate is revoked otherwise it is free to communicate in the network.