The Internet of Things (IoT) by allowing the sensors’ integration represents the backbone of cities that can become smart ones by multiplying sources of information.

 In 2017, already 11.2 billion objects such as infrastructures, roads, street lightings, electricity, water distribution networks or transports were connected ... from simple monitoring to predictive maintenance, scopes of application are numerous

 In cities-wide, those thousands of connected devices transmit small amounts of data through low-speed networks in order to limit energy consumption and costs. France has managed to emerge an alliance concerning the LoRaWan protocol with actors like Bouygues Telecom and Orange or quality players like Sigfox or Qowisio, who struggle each other to impose their standard. However this diversity complicates the implementation of a unique and secure model. 

 Indeed, IoTs are as many possible entry points. To control those flaws, operators must apprehend security on three levels: 

 -        Objects

-        Communication networks

-        The cloud where all data are send 

In addition, operators must be part of the security lifecycle's management. In fact new software deployments, migrations from one cloud to another one, device replacements, involve rigorous management of identities, tokens and keys.