Athanasios Rizos

Usage control for information sharing
Research work: 

The main topic of my research is Usage Control for Information Sharing towards Internet of Things (IoT).
Usage Control is an extension of Access Control. Although Access Control evaluates attributes only once, before the start of a session, Usage Control (UCON) can deal with them if they change during this session. Beyond Access Control, UCON provides two main novelties which are continuity of control and on mutability of attributes that might cause policy revaluation which might lead to revocation.
Security and privacy are important requirements for IoT due to the inherent heterogeneity of the Internet connected objects and the ability to monitor and control physical objects. However, proprietary security solutions do not help in formulating a coherent security vision to enable
IoT devices to securely communicate with each other in an interoperable manner.
One of the most popular application layer protocols used for information sharing in IoT is Message Queue Telemetry Transport (MQTT) which is a lightweight broker-based Publish/Subscribe messaging protocol standardized in 2013 by OASIS.
My main goal is to integrate Usage Control with IoT protocols and especially with MQTT to achieve secure data sharing. Furthermore, I have created a survey towards all famous IoT application layer protocols such as CoAP, XMPP, AllJoyn, etc. to declare why MQTT is the most appropriate to collaborate with UCON.

ESRs Publications


Due to the increasing pervasiveness of Internet of Things (IoT) and Internet of Everything (IoE) devices, securing both their communications and operations has become of capital importance. Among the several existing IoT protocols, Message Queue Telemetry Transport (MQTT) is a widely-used general purpose one, usable in both constrained and powerful devices, which coordinates data exchanges through a publish/subscribe approach. In this paper, we propose a methodology to increase the security of the MQTT protocol, by including Usage Control in its operative workflow. The inclusion of usage control enables a fine-grained dynamic control of the rights of subscribers to access data and data-streams over time, by monitoring mutable attributes related to the subscriber, the environment or data itself. We will present the architecture and workflow of MQTT enhanced through Usage Control, also presenting a real implementation on Raspberry Pi 3 for performance evaluation.