Wireless sensor networks (WSN) are becoming increasingly prevalent because of their diverse applications, which include smart homes, automated production, healthcare, and environmental monitoring. In general, a WSN consists of a gateway node (GN), a user, and a sensor node (SN), that has restricted resources in smart devices. SNs are utilized in a wide range of industries and collect huge volumes of real-time data. GN manages the data acquired by installed SNs in order to deliver legitimate services for consumers. Using a portable device, the user may effortlessly control these smart products from anywhere. Because of their limited storage capacity, embedded systems make it difficult to establish comprehensive authentication methods. When implementing intelligent physical devices for smart applications, system management must include strong authentication, a lightweight security mechanisms, and appropriate consideration for user convenience. Thus, for secure authentication, an Enhanced Lightweight Authentication (ELA) Scheme based on three factors is presented in this approach. In general, authentication process in WSN has three phases that are pre-deployment, registration, and authentication. In Yu and Park, 2020 had presented password change process to enhance the security. However, they need to improve security against smartcard loss and session key leak. Thus, in this paper, we describe the session key update, user revocation, and re-registration phases. The proposed scheme’s performance is evaluated with regard of communication cost, energy cost, and delivery ratio.