Azure IoT Hub does not permit insecure connections. Transport Layer Security (TLS) is always enforced. All messages are tagged with the originator on the service side, allowing the detection of in-payload origin spoofing attempts.

The Azure IoT Hub SDK provides a messaging infrastructure to establish secure communication between the connected devices using several IoT protocols such as HTTPS, MQTT, and AMQPS. HTTP Secure (HTTPS) is one of the industry-standard secure versions of the popular HTTP protocol, and is supported by Azure IoT Hub, thus enabling efficient communication.

There are some Advanced Message Queuing Protocol (AMQP) and Message Queuing Telemetry Transport (MQTT) protocols supported by Azure IoT Hub, which are designed not only for efficiency in terms of resource use, but also reliable message delivery between the IoT Hub and IoT devices over the internet. Azure IoT Hub enables secure connection to both IP-enabled and non-IP-enabled devices.