Due to wide range of applications in current scenario, wireless sensor networks (WSNs) are gaining significant attention of researchers. Providing security and efficient energy utilization simultaneously in WSNs is a difficult task. Development of an energy efficient routing protocol has significant impact on overall stability and lifetime of sensor networks. WSNs may also be used for counterterrorism applications and infrastructure security hence security in such networks is a must. This paper will focus on analyzing existing techniques for enhancing the life time of sensor nodes and providing security at the same time in WSNs.