  Security of wireless sensor network (WSN) is always considered a critical
issue and has a number of considerations that separate them from traditional
wireless sensor network. First, sensor devices are typically vulnerable to
physical compromise. Second, they have significant power and processing
constraints. Third, the most critical security issue is protecting the
aggregate output of the system, even if individual nodes may be compromised.
While a variety of security techniques are being developed and lots of
researches are going on security fields. In this paper we have proposed a new
technique to provide data authentication and privacy in faster, scalable and
cost effective way.
