Attila Kertész

University of Szeged · Department of Software Engineering

Following the outbreak of the COVID-19 virus in the beginning of 2020, a new pandemic has spread over the world, changing our lives. Emerging technologies have played an important role in providing various solutions for preventing virus spreading. Different contact tracing, social distancing and vaccination passport applications have been developed...

Trusted online credential management solutions are needed for instant and practical verification. Most of the available frameworks targeting this field violate the privacy of end-users or lack sufficient solutions in terms of security and Quality-of-Service (QoS). In this paper, we propose a Privacy-aware Fog-enhanced Blockchain-based online creden...

Blockchain (BC) systems mainly depend on the consistent state of the Distributed Ledger (DL) at different logical and physical places of the network. The majority of network nodes need to be enforced to use one or both of the following approaches to remain consistent: i) to wait for certain delays (i.e. by requesting a hard puzzle solution as in Po...

The inevitable evolution of information technology has led to the creation of IoT-Fog-Cloud systems, which combine the Internet of Things (IoT), Cloud Computing and Fog Computing. IoT systems are composed of possibly up to billions of smart devices, sensors and actuators connected through the Internet, and these components continuously generate lar...

In the past ten years, the latest advances in Information and Communication Technology had a significant impact on distributed systems by giving birth to paradigms such as Cloud Computing, Fog Computing and the Internet of Things (IoT). The environments they created are closely coupled in most cases: IoT sensors and devices generate data that have...

Since the proposal of Bitcoin, the world witnessed a mass confusion in official reports and decrees that were subjectively not useful nor justifiable for users. This observation basically stems from several factors, including limited technical knowledge, and/or fear of change that is related to the psychology of the decision maker. Also, there had...

In the past years, we have seen an unprecedented pace of technological development in smart applications. Smart Systems incorporate securely connected sensors, actuators, and data processing resources to provide digital services. They provide a wide range of smart applications using emerging technologies that address governmental or industrial proc...

Blockchain (BC) is the type of distributed ledger technology that consists of a growing list of records, called blocks, that are securely linked together using cryptography. Each BC-based solution deploys a specific consensus algorithm that guarantees the consistency of the ledger over time. The most famous, and yet claimed to be the most secure, i...

The proliferation of Internet of Things (IoT) applications poses formidable challenges in managing data processing, privacy, and security. In response, technologies such as Fog Computing (FC), Blockchain (BC), and Federated Learning (FL) have emerged as promising solutions. Combining these technologies can broaden their scope, and impose novel chal...

(Click on the DOI link above to view the database page) This database is a part of a research project titled: "Distributed Scalability Tuning for Evolutionary Sharding Optimization with Random-equivalent Security in Permessionless Blockchain", in which Blockchain Optimized and Secure Sharding (BOSS) protocol is proposed. This database consists of m...

The modelling of IoT applications utilising the resources of cloud and fog computing is not straightforward because they have to support various trigger-based events that make human life easier. The sequence of tasks, such as performing a service call, receiving a data packet in the form of a message sent by an IoT device, and managing actuators or...

Blockchain (BC) technology has been established in 2009 by S. Nakamoto, using the Proof-of-Work (PoW) to reach consensus in public permissionless networks [1]. Since then, several consensus algorithms were proposed to provide equal (or higher) levels of security, democracy, and scalability, yet with lower levels of energy consumption. However, Naka...

Blockchain (BC) technology provides a secure distributed transactional database, that can enhance the security and privacy of decentralized systems and applications, e.g. distributed identity, supply chain and Internet of Things (IoT). The most known secure consensus mechanism for permissionless BCs is the Proof-of-Wok (PoW) algorithm. Many argue t...

Blockchain (BC) technology provides a secure distributed transactional database, that can enhance the security and privacy of decentralized systems and applications, e.g. distributed identity, supply chain and Internet of Things (IoT). The most known secure consensus mechanism for permissionless BCs is the Proof-of-Wok (PoW) algorithm. Many argue t...

Several revolutionary applications have been built on the distributed ledgers of blockchain (BC) technology. Besides cryptocurrencies, we can find many other application fields in smart systems exploiting smart contracts and Self Sovereign Identity (SSI) management. The Hyperledger Indy platform is a suitable open-source solution for realizing perm...

Fog computing provides an effective solution to various problems by extending the cloud’s functionality to typically more limited computing units closer to user devices. Fog computing can provide a higher level of user experience due to its geographic and network topology location and distribution. IoT services also need to be managed seamlessly to...

p>Thousands of researchers and practitioners around the world neglect foundational understanding of the most trusted cryptocurrency platform, Bitcoin. According to the typical tendency of taking the discussion of Bitcoin's security for granted, it is usually confidently stated that, technically, Bitcoin is one of the most secure platforms for inves...

p>Thousands of researchers and practitioners around the world neglect foundational understanding of the most trusted cryptocurrency platform, Bitcoin. According to the typical tendency of taking the discussion of Bitcoin's security for granted, it is usually confidently stated that, technically, Bitcoin is one of the most secure platforms for inves...

Both revolutionary technologies of Fog Computing (FC) and Blockchain (BC) serve as enablers for enhanced, people-centric trusted applications, and they do meet in the provision of higher standards and expectations. In this paper, we address the reliability of fog-enhanced BC systems by analyzing the forking phenomenon under different conditions, an...

Blockchain is the core technology behind several revolutionary applications that require consistent and immutable Distributed Ledgers, maintained by multi-party authorities. Examples of such applications include cryptocurrencies, smart contracts, Self Sovereign Identity (SSI) and Edge/Fog-enabled smart systems (eHealth, IIoT, IoV, etc.). Hyperledge...

Trusted online credential management solutions are needed for instant and practical verification. Most of the available frameworks targeting this field violate the privacy of end-users or lack sufficient solutions in terms of security and Quality-of-Service (QoS). In this paper, we propose a Privacy-aware Fog-enhanced Blockchain-based online creden...

Trusted online credential management solutions are needed for instant and practical verification. Most of the available frameworks targeting this field violate the privacy of end-users or lack sufficient solutions in terms of security and Quality-of-Service (QoS). In this paper, we propose a Privacy-aware Fog-enhanced Blockchain-based online creden...

Trusted online credential management solutions are needed for instant and practical verification. Most of the available frameworks targeting this field violate the privacy of end-users or lack sufficient solutions in terms of security and Quality-of-Service (QoS). In this paper, we propose a Privacy-aware Fog-enhanced Blockchain-based online creden...

Presently, Internet of Things (IoT) protocols are at the heart of Machine-to-Machine (M2M) communication. Irrespective of the radio technologies used for deploying an IoT/M2M network, all independent data generated by IoT devices (sensors and actuators) rely heavily on the special messaging protocols used for M2M communication in IoT applications....

The unprecedented pace of technological development in smart systems, incorporating sensing, actuation, and control functions, have the following properties and needs: (𝑖) they are interconnected and need scalable, virtualized resources to run, store and process data, (𝑖𝑖) they are mobile and can potentially access and build on user data made avail...

The recent development in wireless networks and devices leads to novel services that will utilize wireless communication on a new level [...]

Both revolutionary technologies of Fog Computing (FC) and Blockchain (BC) serve as enablers for enhanced, people-centric trusted applications, and they do meet in the provision of higher standards and expectations. In this paper, we address the reliability of fog-enhanced BC systems by analyzing the forking phenomenon under different conditions, an...

The continuously evolving information technology carries requirements to foster cost, resource and energy-aware systems. The Internet of Things is considered as one of the most trending technology, which is often coupled with Cloud or Fog Computing resources that manage the possibly big data generated by smart devices in an effective way. To reduce...

Global average temperature had been significantly increasing during the past century, mainly due to the growing rates of Greenhouse Gas (GHG) emissions, leading to a Global Warming problem. Many research works indicated other causes of this problem, such as the Anthropogenic Heat Flux (AHF). Cloud Computing (CC) data centers (DCs), for example, per...

A lot of hard work and years of research are still needed for developing successful Blockchain (BC) applications. Although it is not yet standardized, BC technology was proven as to be an enhancement factor for security, decentralization, and reliability, leading to be successfully implemented in cryptocurrency industries. Fog computing (FC) is one...

In the past decade novel paradigms appeared in distributed systems, such as Cloud Computing, Fog Computing and the Internet of Things (IoT). Sensors and devices of IoT applications need big data to be stored, processed and analysed, and cloud systems offer suitable and scalable solutions for them. Recently fog nodes are utilized to provide data man...

The recently emerged advances in ICT, such as cloud computing, the Internet of Things, and artificial intelligence, enabled the rapid creation of smart environments. Smart devices have appeared in our everyday life gaining access to personal data by monitoring our behavior and needs. To react to this new situation, the European Union introduced the...

The latest services of the Internet are expanded to the edge of the network, which led to the emergence of Internet of Things (IoT), where sensors, actuators and smart devices are connected in order to interop-erate with each other. IoT services often deal with a vast amount of raw data, therefore they collaborate by exploiting cloud resource capab...

Nowadays billions of smart devices or things are present in Internet of Things (IoT) environments, such as homes, hospitals, factories, and vehicles, all around the world. As a result, the number of interconnected devices is continuously and rapidly growing. These devices communicate with each other and with other services using various communicati...

A lot of hard work and years of research are still needed for developing successful Blockchain (BC) applications. Although it is not yet standardized, BC technology was proven as to be an enhancement factor for security, decentralization, and reliability, leading to be successfully implemented in cryptocurrency industries. Fog computing (FC) is one...

In recent years, the deployment of Cloud Computing (CC) has become more popular both in research and industry applications, arising form various fields including e-health, manufacturing, logistics and social networking. This is due to the easiness of service deployment and data management, and the unlimited provision of virtual resources (VR). In s...

Privacy issues in Cloud Computing are one of the major concerns for many individuals and companies around the world, and still a challenge for research and industry. The appearance of the 5G technology and the latest advances in Mobile Cloud Computing gave way to fog-enabled systems that represent the future of current cloud systems. Accordingly, t...

Cloud Computing and the Internet of Things (IoT) have started to revolutionize traditional systems to be smart. Smart farming is an example of this process, that aims to respond to predictions and provisions of population growth by providing smart solutions in agriculture to improve productivity and reduce waste. Plant phenotyping is an important r...

Fog computing (FC) is the extension of Cloud Computing (CC), from the core of the internet architecture to the edge of the network, with the aim to perform processes closer to end-users. This extension is proven to enhance security, and to reduce latency and energy consumption. Blockchain (BC), on the other hand, is the base technology behind crypt...

The recent advances in Information and Communication Technology had a significant impact on distributed systems by giving birth to novel paradigms like Cloud Computing, Fog Computing and the Internet of Things (IoT). Clouds and fogs have promising properties to serve IoT needs, which require enormous data to be stored, processed and analysed genera...

Blockchain technology has been successfully implemented in cryptocurrency industries, yet it is in the research phase for other applications. Enhanced security, decentralization and reliability are some of the advantages of blockchain technology that represent beneficial integration possibilities for computing and storage infrastructures. Fog compu...

Technically Co-Sponsored by IEEE France Section FMEC 2020 CFP: Cloud computing provides large range of services and virtually unlimited available resources for users. New applications, such as virtual reality and smart building control, have emerged due to the large number of resources and services brought by cloud computing. However, the delay-sen...

Next generation cloud systems will require a paradigm shift in how they are constructed and managed. Conventional control and management platforms are facing considerable challenges regarding flexibility, dependability and security that next generation systems will require. The cloud computing paradigm has gone part of the way towards alleviating s...

In the scope of evaluation methodologies for Internet of Things (IoT) systems, some approaches concern security, while others latency. However, some methodologies evaluate systems that contain active entities, so-called actuators. In this paper, we propose a novel methodology for evaluating such systems with actuator components using Graph Represen...

Information and Communications Technology (ICT) is rapidly evolving, social network services and smart applications have started to dominate the world of the Internet spreading on interconnected smart devices. Cloud computing is a key enabler of Internet of Things (IoT) applications, while and Fog and Edge computing provide further methods for effi...

Intelligent systems are wanting for cities to cope with limited spaces and resources across the world. As a result, smart cities emerged mainly as a result of highly innovative ICT industries and markets, and additionally, they have started to use novel solutions taking advantage of the Internet of Things (IoT), big data and cloud computing technol...

Infrastructure as a service clouds hide the complexity of maintaining the physical infrastructure with a slight disadvantage: they also hide their internal working details. Should users need knowledge about these details e.g., to increase the reliability or performance of their applications, they would need solutions to detect behavioural changes i...

The Internet of Things (IoT) is the latest trend of the current ICT evolution, represented by a huge amount of powerful smart devices that have started to appear on the Internet. By responding to this new trend, many cloud providers have started to offer services for IoT management. Recent advances have already shown that cloud computing can be use...

Cloud Computing has become the major candidate for commercial and academic compute infrastructures. Its virtualized solutions enable efficient, high-rate exploitation of computational and storage resources due to recent advances in data centre consolidation. Resources leased from these providers are offered under many pricing schemes which are ofte...

According to a recent Beecham Research report, food production have to be increased by 70 percent till 2050 to feed 9.6 billion global population predicted by the United Nations Food and Agriculture Organisation. Since Cloud Computing and the Internet of Things (IoT) have already opened new ways for revolutionizing industrial processes, as a result...

Data protection by design aims to reduce possible privacy harms that fog applications may cause by combining it with the data protection impact assessment (DPIA) and the data protection enhancing technologies. This chapter classifies fog/edge/Internet‐of‐Things (IoT) applications, analyzes the latest restrictions introduced by the General Data Prot...

There is a growing number of communicating devices joining the Internet, and we will soon face a world of a distributed computing environment with interconnected smart devices. Cloud-based systems have also started to dominate the Internet space, with the emergence of the Internet of Things (IoT) paradigm. In spite of the huge developments in the c...

In the paradigm of Internet of Things (IoT), sensors, actuators and smart devices are connected to the Internet. Application providers utilize the connectivity of these devices with novel approaches involving cloud computing. Some applications require in depth analysis of the interaction between IoT devices and clouds. Research in this area is faci...