@article {831,
	title = {Blockchain meets Internet of Things (IoT) forensics: A unified framework for IoT ecosystems},
	journal = {Internet of Things},
	year = {2023},
	month = {oct},
	pages = {100968},
	abstract = {<p>With the continuously increasing number of security incidents targeting sensors, embedded devices, and other electronics appliances and systems that comprise the so-called Internet of things (IoT), the field of IoT forensics emerged as a branch of digital forensics focusing on the investigation of attacks in the IoT ecosystem. Digital evidence authenticity, integrity, confidentiality, and privacy are among the factors affecting the investigation process in IoT forensics, which can be addressed by employing the blockchain as the means not only for the preservation of digital evidence, but also for other steps of a digital forensics investigation process. The high-level goal of the paper is three-fold: to establish a holistic IoT forensics process as a reference point against which blockchain integration patterns and best practices will be identified in order to yield a robust, widely accepted and scalable architecture of the blockchain-enabled solution; to integrate the blockchain with the proposed IoT forensics process for addressing the above challenges; and to evaluate the overall solution highlighting improvements and potential performance bottlenecks. The proposed blockchain-enabled platform leverages multi-access edge computing and has been implemented with Hyperledger Fabric on an extensive virtualized testbed providing a realistic smart home environment. A thorough evaluation was conducted with real cyber-attacks generating digital evidence at high rates for testing the platform{\textquoteright}s behavior at high load. The experimental results showed that the proposed platform achieved high throughput, excessively low latency, and zero error rate in the operation of the blockchain network.</p>
},
	keywords = {blockchain, cyber-security, Digital forensics, Edge computing, Internet of Things},
	doi = {10.1016/j.iot.2023.100968},
	url = {https://www.sciencedirect.com/science/article/pii/S2542660523002913},
	author = {Sotirios Brotsis and Konstantinos P. Grammatikakis and Dimitrios Kavallieros and Antonio I. Mazilu and Nicholas Kolokotronis and Konstantinos Limniotis and Costas Vassilakis}
}
@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}
}
@article {vassilakis2019HV,
	title = {Blockchain technologies for leveraging security and privacy},
	journal = {Homo Virtualis},
	volume = {2},
	number = {1},
	year = {2019},
	pages = {7{\textendash}14},
	abstract = {The contemporary internet has developed into a complex ecosystem involving humans, services, applications, machines and applications that interact exchanging information, ranging from e-mail messages and social media content to crowdsourcing data and videoconferencing. In this context, a number of security threats such as viruses and malware exist, while additionally the users{\textquoteright} privacy is jeopardized by threats such as personal data leakage, usage pattern monitoring, and so forth. The IoT trend renders the Internet ecosystem even more complex, by adding a rich set of services, applications and machines, many of them backed by new user roles; these elements are weaved into everyday life and industry alike. This increases both the number of opportunities available to threat agents for exploitation and the volume and value of the underlying infrastructure and data, increasing thus the user risk level. In this paper, we explore how the Blockchain technology can be used to leverage security and privacy in the modern Internet, both by providing underpinnings for preventive measures and by facilitating digital forensic evidence collection storage, safeguarding and controlled access.},
	keywords = {blockchain, Internet of Things, privacy, security},
	issn = {2585-3899},
	doi = {http://dx.doi.org/10.12681/homvir.20188},
	url = {https://ejournals.epublishing.ekt.gr/index.php/homvir/article/view/20188},
	author = {Costas Vassilakis}
}
@article {715,
	title = {Bringing a peripheral, traditional venue to the digital era with targeted narratives},
	journal = {Digital Applications in Archaeology and Cultural Heritage},
	volume = {14},
	year = {2019},
	month = {sep},
	pages = {e00111},
	abstract = {The current work presents a method of enhancing museum content with narratives targeting history reflection in a personalized manner, delivered by an especially designed mobile app. The mobile app is a part of a technology ecosystem that supports the visitor before, during and after her visit. Within the framework of the European H2020 CrossCult project, a method was designed, implemented and tested to enhance museum content with digital material, enriched narratives and means to actively engage visitors. In particular, the method was implemented and tested for the content of the Archaeological Museum of Tripolis (Greece) and specific content examples are presented here, together with data from visitor evaluation. The results showed that content was significantly and qualitatively enhanced and visitors recognized the potential of the app in triggering visitor curiosity, new forms of engagement, and the ability to reflect on the connections between historical and social phenomena.},
	keywords = {Cultural heritage, Museum app, Narratives, reflection, Visitor experience},
	doi = {10.1016/j.daach.2019.e00111},
	url = {https://www.sciencedirect.com/science/article/pii/S2212054819300098},
	author = {Angeliki Antoniou and Susana Reboreda Morillo and George Lepouras and Jason Diakoumakos and Costas Vassilakis and Martin Lopez Nores and Catherine Emma Jones}
}
@inbook {Vasilakis2018BigData,
	title = {Big Data Platforms and Applications},
	year = {2018},
	publisher = {Springer},
	organization = {Springer},
	chapter = {exhiSTORY: Smart self-organizing exhibits},
	abstract = {Creating stories for exhibitions is a fascinating and in parallel laborious task. As every exhibition is designed to tell a story, museum curators are responsible for identifying, for each exhibit, its aspects that fit to the message of the story and position the exhibit at the right place in the story thread. In this context we analyze how the technological advances in the fields of sensors and Internet of Things can be utilized in order to construct a "smart space", which consists of self-organizing exhibits that cooperate with each other and provide visitors with comprehensible, rich, diverse, personalized and highly stimulating experiences. We present the system named "exhiSTORY" that intends to provide the appropriate infrastructure to be used in museums and places where exhibitions are held in order to support smart exhibits. The architecture of the system and its application potential is presented and discussed.},
	author = {Costas Vassilakis and Vassilis Poulopoulos and Angela Antoniou and Manolis Wallace and Giorgos Lepouras and Martin Lopez Nores},
	editor = {TBC}
}
@article {Vassilakis_barriersto,
	title = {Barriers To Electronic Service Development},
	journal = {e-Service Journal},
	volume = {Fall 2005},
	year = {2005},
	pages = {41-63},
	abstract = {E-government initiatives have been proven to deliver significant benefits, both for suppliers of electronic services (public authorities and organizations) and for the public, to whom services are addressed. However, the pace with which electronic services are made available and adopted is lower than planned or expected; governments tend to be slow in releasing new services, and citizens often prefer to conduct business with the government through paper forms and physical presence, rather than using online methods. This indicates that certain barriers exist that hinder the transition to electronic services. In this paper, we present the results of a survey among electronic service stakeholder groups, to identify the most important barriers to electronic service development. Documentation of barriers is considered important, since administrations may take certain measures to overcome them. Hints on how specific barriers may be overcome are also provided.},
	doi = {10.2979/esj.2005.4.1.41},
	author = {Costas Vassilakis and Giorgos Lepouras and John Fraser and Simon Haston}
}
@conference {vassilakis05b,
	title = {A Blackboard-oriented Architecture for e-Government service composition},
	booktitle = {Proceedings of the IRMA 2005 conference},
	year = {2005},
	month = {5},
	abstract = {A requirement for electronic government initiatives to succeed is the ability to offer a citizen-centric view of the government model. The most widely adopted paradigm supporting this task is the life event model, which combines basic services offered from multiple public authorities into a single, high-level service that corresponds to an event in a citizen{\textquoteright}s life. This composition is not always straightforward though, because the constituent services are generally developed in an independent fashion, using incompatible input and output formats; moreover the task of synchronising the documents required and produced by the services is tedious to implement and costly to maintain, since changes to requirements and legislation necessitate continuous updates to this scheme. In this paper, we present a blackboard architecture that can be used to deliver life-event oriented services to the citizens. The blackboard proposed for this architecture is an active one, undertaking the tasks of conversions, where appropriate. The blackboard couples a data flow approach with event-condition-action rules to enable dynamic formulation of life-event services, decentralising their development and maintenance.},
	author = {Costas Vassilakis and Anya Sotiropoulou and Dimitrios Theotokis and D. Gouscos}
}
@conference {Lep01a,
	title = {Building a VR - Museum in a Museum},
	booktitle = {Proceedings of the Third International Virtual Reality Conference, VRIC2001},
	year = {2001},
	month = {5},
	abstract = {Past years have seen the exploitation of multimedia techniques and lately the introduction of virtual reality methods to create new forms of presentation for museums{\textquoteright} exhibitions. Virtual Reality can offer a number of advantages to museums, offering a way to overcome some common problems like the lack of space or the need of visitors to interact with the exhibits. A broad categorisation of virtual museums reveals that they vary from fully immersive cave systems to simple multimedia presentations. In our approach to develop a virtual reality museum we have designed a virtual environment (VE) where guests can visit a total of ten different museums. The processes of digitisation, architectural design and exhibit presentation are outlined and points of particular importance are explained. Exhibits from the real world museums have been digitised and integrated in the VE. The system has been implemented in two versions: one fully immersive and one with a stereo display.},
	author = {Giorgos Lepouras and D. Charitos and Costas Vassilakis and Charissi, A. and Halatsi, L.}
}
