Description: Node authentication is the process of verifying the identity of a device or node in a network. This mechanism is fundamental in identity and access management, especially in environments where multiple devices interact with each other, such as in the Internet of Things (IoT). Node authentication ensures that only authorized devices can communicate and operate within a network, thereby protecting the integrity and confidentiality of data. This process can involve various techniques, such as the use of digital certificates, cryptographic keys, or specific authentication protocols. Node authentication not only focuses on identifying the device but may also include validating its state and configuration, ensuring that the node has not been compromised or altered. In an increasingly interconnected world, where IoT devices are ubiquitous, node authentication becomes an essential pillar for network security, preventing unauthorized access and cyberattacks that could compromise critical systems. Therefore, implementing robust node authentication methods is crucial for maintaining trust in interactions between devices and in protecting sensitive information that they handle.