The scope of the project is to analyse MQTT protocol (used in IoT application) to detect malicious contexts in real use cases and analyse possible workarounds. The studies performed are: - MQTT protocol features analysis: it is a protocol used to transport messages, mainly used in IoT environment given its lightweightness; - Malicious contexts analysis: given its lightweightness, MQTT has not security mechanisms by default, in order to maintain it simple to be runned by resource constrained devices like IoT ones; - Workarounds analysis: identification of countermeasures able to guarantee authentication, confidentiality and integrity of MQTT messages; - State of the art of MQTT security solutions: analysis of innovative solutions developed to provide security to MQTT protocol; - Determining target use case; - Design, implementation and testing of a demo.