A Secure and Efficient Authentication System for Distributed Wireless Sensor Network

X-TESLA, a new member of the TESLA family uses two levels of chains that have distinct intervals and cross-authenticate each other are used. This allows the short key chains to continue indefinitely and makes new interesting strategies and management methods possible, significantly reducing unnecessary computation and buffer occupation. We propose a technique X-TESLA, can efficiently be combined with public-key techniques. In this, data are splitted into two halves and that data's are encrypted. So that dos attack and other attacks are completely prevented. This encryption is done by RSA algorithm.