A Wireless Sensor Network (WSN) is an evolving technology and getting significant attention due to its unlimited potential starts from domestic application to battlefield. Wireless Sensor Networks(WSN) are a most challenging and emerging technology for the research due to their vital scope in the field coupled with their low processing power and associated low energy. Today wireless sensor networks are broadly used in environmental control, surveillance tasks, monitoring, tracking and controlling etc. Sensor nodes are tiny, cheap, disposable and self-contained battery powered computers, known as "motes”, which can accept input from an attached sensor, process this input data and transmit the results wirelessly to the transit network. Due to the various applications of WSN in homeland security and military, security is the major issue to be taken care of. In this paper we discuss about The combination of these factors demands security for sensor networks at design time to ensure operation safety, secrecy of sensitive data, and privacy for people in sensor environments. Broadcast authentication is a critical security service in sensor networks; it allows a sender to broadcast messages to multiple nodes in an authenticated way. µ TESLA and multi-level µTESLA have been proposed to provide such service for sensor networks.
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