Enhancing security in Optimized Link State Routing protocol for MANET using threshold cryptography technique

The Optimized Link State Routing is a proactive link state routing protocol for Mobile Ad hoc Network. The Multipoint Relays nodes which are one-hop neighbors are used as a means for flooding of control and traffic messages into the network. The RFC 3626 does not consider the security issues. The secured OLSR framework consists of security module which provides the security with minimum overhead. The overhead is reduced by minimizing the number of Multipoint Relay nodes in the network and providing security for those selected nodes. The security is provided with the help of threshold cryptography technique. The use of threshold cryptography is to provide security measures by distributing the secret key shares and performing encryption with those shares of secrets. The share can be reconstructed using Lagrange interpolation. The destination could recover only if all or threshold numbers of the secret shares are not compromised. The share update mechanism is also aimed which provide security, when the threshold number of shares are compromised. The main aim is to provide the truthfulness of routing messages, especially Topology Control messages and hence prevent forwarding nodes from varying routing messages while forwarding them. The simulation of the above ideas also confirms the results and provides better security and performance improvement.