@conference {789,
	title = {A Trust Management System for the IoT domain},
	booktitle = {Proceedings the 2020 IEEE World Congress on Services (SERVICES)},
	year = {2020},
	publisher = {IEEE},
	organization = {IEEE},
	abstract = {<p>In modern internet-scale computing, interaction between a large number of parties that are not known a-priori is predominant, with each party functioning both as a provider and consumer of services and information. In such an environment, traditional access control mechanisms face considerable limitations, since granting appropriate authorizations to each distinct party is infeasible both due to the high number of grantees and the dynamic nature of interactions. Trust management has emerged as a solution to this issue, offering aids towards the automated verification of actions against security policies. In this paper, we present a trust- and risk-based approach to security, which considers status, behavior and associated risk aspects in the trust computation process, while additionally it captures user-to-user trust relationships which are propagated to the device level, through user-to-device ownership links.</p>
},
	keywords = {associated risk, behavior, Internet-of-things, status, trust management},
	doi = {10.1109/SERVICES48979.2020.00047},
	author = {Christos-Minas Mathas and Costas Vassilakis and Nicholas Kolokotronis}
}
@conference {Kolokotronis2019IEEESrv,
	title = {On Blockchain Architectures for Trust-based Collaborative Intrusion Detection},
	booktitle = {Proceedings of the 1st IEEE Services Workshop on Cyber Security and Resilience in the Internet Of Things, within IEEE Services 2019},
	year = {2019},
	publisher = {IEEE},
	organization = {IEEE},
	abstract = {This paper considers the use of novel technologies for mitigating attacks that aim at compromising intrusion detection systems (IDSs). Solutions based on collaborative intrusion detection networks (CIDNs) could increase the resilience against such attacks as they allow IDS nodes to gain knowledge from each other by sharing information. However, despite the vast research in this area, trust management issues still pose significant challenges and recent works investigate whether these could be addressed by relying on blockchain and related distributed ledger technologies. Towards that direction, the paper proposes the use of a trust-based blockchain in CIDNs, referred to as trust-chain, to protect the integrity of the information shared among the CIDN peers, enhance their accountability, and secure their collaboration by thwarting insider attacks. A consensus protocol is proposed for CIDNs, which is a combination of a proof-of-stake and proof-of-work protocols, to enable collaborative IDS nodes to maintain a reliable and tampered-resistant trust-chain.},
	keywords = {blockchain, collaborative intrusion detection, insider threats, security, trust management},
	author = {Nicholas Kolokotronis and Sotirios Brotsis and Georgios Germanos and Costas Vassilakis and Stavros Shiaeles}
}
