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Wireless sensor network (WSN) is an emerging technology used in emergency scenarios. There are a number of possible threats to WSNs because they use unsupervised IP addresses. Securing networks with unattended sensors is a real challenge nowadays. Sensor nodes lack power and storage, making them incompatible with normal security checks. It will be vital to make advancements in sensor network architecture and protocol design. There will be more vulnerability to attack if there is a lack of security. Especially, one key attack is node replication which induces the sensor node to acts as an original node, collecting data from the network and sending it to the attacker. In dynamic WSN, detecting an assault is difficult to find replica nodes. Therefore, this paper proposes a Strategic Security System (SSS) to discover replica nodes in static and dynamic distributed WSNs. It is mainly focused on enhancing detection accuracy, time delay, and communication overhead. The present system includes Single Stage Memory Random Walk with Network Division (SSRWND) and a Random-walk-based approach to detect clone attacks (RAWL). The proposed system has less memory and better detection accuracy.

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Wireless Sensor Network (WSN) is used for collecting the information from the environment. WSN consists of large number of Sensor Nodes (SN). Each Sensor Nodes in the network are connected by a wireless Channels. The node will sense the environmental data and sends to the other sensor nodes or Base Station. During the transmission of data from one node to another node, different security techniques are used. To implement security, such as confidentiality, integrity and authentication, keys are needed. But the Wireless Sensor Networks are very difficult to secure due to its mobility. Key Management is important for implementing security in a wireless Sensor Network. This paper presents a roaming sensor node that provides security for the data while allowing a sensor node to move across multiple WSNs. The proposed key management technique is by using Virtual Certificate (VC). It provides a mechanism to overcome the difficulties in securing the networks. The simulation results are conducted to verify the validity of the proposed schemes and analytically investigate the energy performance and communication overhead and packet loss.