Abstract
Internet of Things (IoT) is the interconnection, through the Internet network, of different devices that collect and exchange data automatically using, each, a unique identifier. An important component in the communication system is the communication protocol. In IoT, protocols of the publication / subscription style are generally used where the information providers have no direct link with the consumers of said information but through intermediaries, one of them being the MQTT (Telemetry Transport of the message queue) protocol. which is built on the TCP / IP stack. Given the characteristics of this protocol, it is possible to use it in both industrial devices and collaborative robots, constituting the use of these two technologies together as part of the Internet of Robotic Things (IoRT). In this way IoT allows to increase the efficiency and effectiveness of different processes in which it participates from those of daily life to those of high complexity and security requirements and in conjunction with robotics it tends to play an important role by allowing operators of robots exercise greater control over their equipment, since it will allow remote manipulation using only one application, even in a changing and dynamic environment ideal for the operation of collaborative robots.
The rapid evolution of IoT services also poses other problems such as security, since the MQTT protocol is shown to be very vulnerable to possible attacks, thus representing a danger to data integrity and constituting a risk to the users. Therefore, it is necessary to adopt security approaches that guarantee a set of criteria to avoid possible cyber attacks. To this end, this work proposes to apply encryption in the content of the messages that are sent in order to neutralize the different means of interception used by the attackers. For this, the MQTT protocol is implemented using as an intermediary an IoT broker service, a connection application and a graphical interface and a symmetric encryption mechanism is used for the generation of keys both in the sending client and in the connected devices. The benefit of this approach is the transmission of messages safely and at a low cost. There is much still to investigate and develop, in this aspect, since this is how technology evolves, new ways of producing attacks on data and devices also emerge.