Cluster Based Secure Data Broadcast of CLAODV Protocol for MANET

Ad-hoc Networks are using multicast protocol to broadcast the messages. Multicast authentication in ad-hoc networks are very challenging based on below mentioned multiple factors such as nodes have limited computing, bandwidth, and energy resources. Additionally, frequent packet loss errors require a security solution that can tolerate missed packets. The existing cryptography techniques are inefficient for multicast traffic patterns. Since using a common key for all receivers will make it relatively easy to impersonate a sender by any one of the receiving nodes. The proposed system exploits network clustering and routing technique in order to cut the overhead and ensure scalability. Multicast traffic in intra cluster using one-way hash chains to authenticate the message source. In the inter cluster, (i.e. cross cluster) multicast traffic includes message authentication codes that are based on multiple keys. In order to authenticate the source, each cluster uses a unique subset of keys to looks for its distinct combination of message authentication codes in the message. The source generates the keys at the time of establishing the multicast session. The keys will be securely transmitted to the head of every cluster that hosts one or multiple receivers. The multicast message is then transmitted to the cluster-heads which authenticate the source and then deliver the message to the intended receivers. Keywords— Multicast communications, Message authentication, ad-hoc networks.