  Wireless Sensor Network (WSN) is consisting of independent and distributed
sensors to monitor physical or environmental conditions, such as temperature,
sound, pressure, etc. However, the limited resources of sensors and hostile
environments in which they could be deployed, make this type of networks
vulnerable to several types of attacks similar to those occurring in ad hoc
networks. The most crucial and fundamental challenge that WSN is facing is
security. The primary subject of all my work is to address this issue. Due to
minimum capacity in term of memory cost, processing and physical accessibility
to sensors devices the security attacks are problematic. They are mostly
deployed in open area so are more exposed to different kinds of attacks. They
must be designed in a way to successfully recover itself from different kinds
of attacks. In this paper, we proposed a new lightweight cryptography algorithm
based on LEAP+. Our evaluations on TOSSIM give a precise and detailed idea of
the extra cost of consumption of resources needed to ensure the high level of
expected security.
