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The explosive growth in the use of mobile and wireless devices demands a new generation of remote user authentication schemes that has to accommodate limitations on power and bandwidth, at the same time, to provide an adequate level of security for transferred data in wireless networks. In this paper, we present a new method of access control adapted to constrained Wireless Sensor Networks (WSNs), that's provide access to legitimate users and deny access to illegitimate ones. Our scheme is based on the ID-based techniques and the Elliptic Curve Cryptography (ECC). The proposed protocol provides mutual authentication and key establishment between the user and a gateway node in the WSN.