Secure Packet Encryption and Key Exchange System in Mobile Ad hoc Nerwork

Problem statement: Mobile Ad-hoc Network is infrastructureless network supported by no fixed trusted infrastructure. The packets had a chance to drop or hacked by eavesdropper during transmission. So, encryption method is required for sending and receiving packet in secret manner. Approach: In this approach, the block and key size had been increased by 256 bits. When compared to Rijndael algorithm, it was more secure and effective. To attain security goals like: authentication, integrity, non- repudation, privacy, a secret key was necessary to be shared between the sender and receiver. For data communication, we use MAC address for exchanging packet with encrypted key exchange system. Results: For encryption, In Rijndael algorithm the whole data had to be run twice but our proposed algorithm would encrypt the whole data and run once. The encryption was done with neighborhood key and with message specific key for the enhancement of security. Conclusion: In our algorithm, the time required to break an encryption scheme is excessive as the key size is larger. Here the security is focusing the application level. The forward and backward security is ensured with neighborhood and with message specific key for the route discovery.