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Wireless Sensor Network (WSN) is a talented technology that shows great assurance for a variety of ultramodern applications both for mass public and military. The appearance of sensor networks as one of the central technology trends in the coming decades has posed several exclusive challenges to researchers. The key research spotlight has been on making sensor networks sufficient and helpful. This paper analyzes security requirements in wireless sensor networks and summarizes key issues, attacks and threats that should be solved for achieving the ad hoc security. We also present some secure solutions for achieving the security in wireless sensor networks.