People

Faculty members

• George C. Polyzos, Professor, Lab Director
• Vasilios Siris, Associate Professor
• Spyros Voulgaris, Assistant Professor

Senior Researchers

• Nikos Fotiou, Ph.D.
• Yannis Thomas, Ph.D.

Ph.D. Students

• Dimitris Dimopoulos
• Christos Karapapas
• Iakovos Pittaras

Dissemination

Journal publications

• V.A. Siris, D. Dimopoulos, N. Fotiou, S. Voulgaris, G.C. Polyzos, "Decentralized authorization in constrained IoT environments exploiting interledger mechanisms", In Elsevier Computer Communications, https://doi.org/10.1016/j.comcom.2020.01.030 Pre-print version
• S. Voulgaris, N. Fotiou, V. A. Siris, G.C. Polyzos, M. Jaatinen, Y. Oikonomidis, "Blockchain Technology for Intelligent Environments", MDPI Future Internet, vol. 11(10), Oct 2019 View (Open access)
• V.A. Siris, P. Nikander, S. Voulgaris, N. Fotiou, D. Lagutin, G.C. Polyzos, "Interledger Approaches", In IEEE Access, 2019 View (Open access)
• Y. Kortesniemi, D. Lagutin, T. Elo, N. Fotiou "Improving the Privacy of IoT with Decentralised Identifiers (DIDs) ", In Journal of Computer Networks and Communications, Hindawi, vol. 2019, 2019 Download

Conferences/Workshops publications

• N. Fotiou, I. Pitarras, V.A. Siris, S. Voulgaris, G.C. Polyzos, "OAuth 2.0 authorization using blockchain-based tokens," Proceedings of the NDSS 2020 Workshop on Decentralized IoT Systems and Security (DISS), San Diego, CA, USA, 2020 Download paper
• V.A. Siris, M. Tsenos, D. Dimopoulos, N. Fotiou, G.C. Polyzos, "Decentralized Interledger Gateway Architectures in Authorization Scenarios with Multiple Ledgers," Proc. Global Internet of Things Summit (GIoTS), June 2020. Download paper
• C. Karapapas, I. Pittaras, N. Fotiou, G.C. Polyzos,"Ransomware as a Service using Smart Contracts and IPFS," in Proceedings of the IEEE International Conference on Blockchain and Cryptocurrency, Toronto, Canada, 2020 Download paper
• V.A. Siris, D. Dimopoulos, N. Fotiou, S. Voulgaris, G.C. Polyzos, "Trusted D2D-based IoT Resource Access using Smart Contracts," in 20th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM 2019) Washington DC, USA, 2019 Download paper, Download Presentation
• N. Fotiou, I. Pitarras, V.A. Siris, S. Voulgaris, G.C. Polyzos, "Secure IoT access at scale using blockchains and smart contracts," in 8th IEEE WoWMoM Workshop on the Internet of Things: Smart Objects and Services, IoT-SoS 2019, Washington DC, USA, 2019 Download paper
• V.A. Siris, D. Dimopoulos, N. Fotiou, S. Voulgaris, G.C. Polyzos, "IoT Resource Access utilizing Blockchains and Trusted Execution Environments," Global IoT Summit, Aarhus, Denmark, 2019 Download paper, Download Presentation
• V.A. Siris, D. Dimopoulos, N. Fotiou, S. Voulgaris, G.C. Polyzos, "OAuth 2.0 meets Blockchain for Authorization in Constrained IoT Environments," IEEE 5th World Forum on Internet of Things, Limerick, Ireland, 2019 Download paper, Download Presentation
• V.A. Siris, D. Dimopoulos, N. Fotiou, S. Voulgaris, G.C. Polyzos, "Interledger Smart Contracts for Decentralized Authorization to Constrained Things," 2nd Workshop on Cyptocurrencies and Blockchains for Distributed Systems (CryBlock 2019), co-located with IEEE INFOCOM 2019, Paris, France, 2019 Download paper, Download presentation
• N. Fotiou, V. A. Siris, S. Voulgaris, G.C. Polyzos, D. Lagutin, "Bridging the Cyber and Physical Worlds using Blockchains and Smart Contracts," NDSS Workshop on Decentralized IoT Systems and Security (DISS),San Diego, CA, USA, 2019 Download paper
• D. Lagutin, Y, Kortesniemi, N. Fotiou, V.A. Siris, "Enabling Decentralised Identifiers and Verifiable Credentials for Constrained Internet-of-Things Devices using OAuth-based Delegation," NDSS Workshop on Decentralized IoT Systems and Security (DISS), San Diego, CA, USA, 2019 Download paper
• N. Fotiou, V. A. Siris, G.C. Polyzos, "Interacting with the Internet of Things Using Smart Contracts and Blockchain Technologies", Proc. of Security, Privacy, and Anonymity in Computation, Communication, and Storage 2018 (SpaCCS 2018), Melbourne, Australia, 2018 Download
• N. Fotiou, G.C. Polyzos, "Smart contracts for the Internet of Things: opportunities and challenges", Proc. of the European Conference on Networks and Communications (EUCNC), Ljubljana, Slovenia, 2018 Download
• N. Fotiou, G. C. Polyzos, "Blockchain-assisted Information Distribution for the Internet of Things", Proc. of the 4th International Workshop on Information Integration in Cyber Physical Systems (IICPS 2017), San Diego, California, USA, 2017 Download

External Presentations

• N. Fotiou, "Using Verifiable Credentials in IoT Services," June 2020 W3C WoT Online F2F, 2020 Download
• G.C. Polyzos, "IoT space and where SOFIE fits in, what kind of results are produced - a broader sense overview", cyberwathing.eu virtual workshop on Decentralized operation and security in the IoT Space, 2020 Download
• V.A. Siris, "Enabling Decentralised Identifiers and Verifiable Credentials for Constrained IoT Devices", cyberwathing.eu virtual workshop on Decentralized operation and security in the IoT Space, 2020 Download
• V.A. Siris , "Blockchains and Authorization inConstrained IoT Environments," Presentation at the blockchain for the IoT panel, IOTWeek 2019, Aarhus, Denmark, 2019 Download
• G.C. Polyzos, "Bridging the Cyber and Physical worlds using Blockchains and Smart Contracts," Presentation at the SIST School's workshop on 17 April 2019 Download
• G.C. Polyzos, SOFIE Project presentation during the European H2020 Cluster Workshop in Athens on 15 March 2019 Download

Online articles

• N. Fotiou, "Integrating Verifiable Credentials and Decentralized Identifiers for identification and authorization in the IoT" View
• V.A. Siris, "The role of Distributed Ledger Technology (DLT) for authorization in environments with constrained IoT devices" View

Courses and Thesis

• Distributed Ledger Technologies and Smart Contracts, MSc. Course, taught at MSc in Computer Science Program by N. Fotiou