Cypherbridge Systems' e802.1X SDK is an enterprise software library designed for IoT, Edge, and Gateway systems. It implements IEEE 802.1X EAPOL, EAP, and EAP-TLS mutual authentication, as well as 802.1AE MACsec. The SDK provides LAN layer 2 port-based authentication for enterprise or automotive network switches using RADIUS. It is a portable software library integrated with Cypherbridge SDKPac uTLS™ and uCrypt™ Software Development Kits, providing network level access control, authentication, and authorization. The SDK supports 802.1X-2020 and is interoperable with enterprise network equipment from manufacturers like Cisco, Juniper, and NETGEAR. It is applicable in sectors such as energy, healthcare, industrial control, financial systems, and manufacturing, and is designed for integrating IoT devices with Operational Technology (OT) and Information Technology (IT) systems.