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1

Decentralized device authentication for cloud systems with blockchain using skip graph algorithm

Sammy F., Vigila S. Maria Celestin

Computer Assisted Methods in Engineering and Science

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2023

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Vol. 30, no. 2

203--221

EN

Cloud computing provides centralized computing services to the user on demand. Despite this sophisticated service, it suffers from single-point failure, which blocks the entire system. Many security operations consider this single-point failure, which demands alternate security solutions to the aforesaid problem. Blockchain technology provides a corrective measure to a single-point failure with the decentralized operation. The devices communicating in the cloud environment range from small IoT devices to large cloud data storage. The nodes should be effectively authenticated in a blockchain environment. Mutual authentication is time-efficient when the network is small. However, as the network scales, authentication is less time-efficient, and dynamic scalability is not possible with smart contract-based authentication. To address this issue, the blockchain node runs the skip graph algorithm to retrieve the registered node. The skip graph algorithm possesses scalability and decentralized nature, and retrieves a node by finding the longest prefix matching. The worst time complexity is O(log n) for maximum n nodes. This method ensures fast nodal retrieval in the mutual authentication process. The proposed search by name id algorithm through skip graph is efficient compared with the state-of-art existing work and the performance is also good compared with the existing work where the latency is reduced by 30–80%, and the power consumption is reduced by 32–50% compared to other considered approaches.

2

A comparative analysis of cryptocurrency wallet management tools

Biernacki Kamil, Plechawska-Wójcik Małgorzata

Journal of Computer Sciences Institute

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2021

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Vol. 21

373-377

EN

The work is devoted to a comparative analysis of tools for managing a cryptocurrency portfolio. The study aimed to find out which of the tools is currently the best solution for users. This analysis was carried out on the basis of two tools, first: a survey conducted of among 41 responders who are cryptocurrency users, and the second one: cognitive walkthrough. Conducted analysis confirmed the thesis that the Trust Wallet tool is currently the best solution for users.

PL

Praca poświęcona jest analizie porównawczej narzędzi do zarządzania portfelem kryptowalut. Badanie miało na celu stwierdzić, który z portfeli stanowi obecnie najlepsze rozwiązanie dla użytkowników. Analiza ta została przeprowadzo-na na podstawie dwóch narzędzi, pierwszego: ankiety przeprowadzonej wśród 41 respondentów, którzy są użytkowni-kami kryptowalut, oraz drugiego: wędrówki poznawczej. Wykonana analiza potwierdziła tezę, że portfel Trust Wallet stanowi obecnie najlepsze rozwiązanie dla użytkowników.

3

A decentralized group signature scheme for privacy protection in a blockchain

Devidas S., Rao Y.V. Subba, Rekha N. Rukma

International Journal of Applied Mathematics and Computer Science

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2021

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Vol. 31, no. 2

353--364

EN

Group signature schemes play a vital role in protecting identity privacy of a member of a group who signs a message using the group signature. However, in the existing group signature schemes the centralized group manager has control over all the participants, and these managers can be malicious. They may take a biased decision when there is a dispute among the group members or while revealing the identity of a group member. To overcome the trust issues related to centralized group managers and to improve user privacy, a decentralized group signature scheme (DGSS) is proposed by decentralizing the role of the group manager. The proposed scheme will be more suitable for decentralized environments like a blockchain. Security analysis along with the proof of correctness is also provided for the proposed scheme. A framework for a blockchain-based e-auction protocol using the DGSS is also proposed in this paper.

4

Przykładowe możliwości wykorzystania technologii blockchain w elektroenergetyce

Mrowiec D., Sołtysik M.

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

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2018

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nr 103

133--143

PL

Blockchain to technologia, która w przyszłości może zrewolucjonizować wiele branż na świecie. System ten bazuje na łańcuchu bloków służących do przechowywania i przesyłania w sposób rozproszony różnorodnych informacji, tworząc zdecentralizowany rejestr danych. Pomimo stosunkowo wczesnej fazy rozwoju poszczególnych istotnych projektów opartych na systemie blockchain w branży energetycznej, rozwiązaniom zakładających wykorzystanie tej technologii w szeroko pojętej elektroenergetyce przypisuje się bardzo duży potencjał. W niniejszym artykule zawarto krótki opis samej technologii blockchain, jej ogólnej zasady działania oraz możliwości, jakie za sobą niesie. W kolejnej części scharakteryzowano dwa przykładowe i możliwe zastosowania aplikacyjne technologii blockchain, które w perspektywie mogą mieć znaczący wpływ na sektor elektroenergetyczny. Pierwsze rozwiązanie związane jest z przeprowadzaniem i rozliczaniem transakcji kupna oraz sprzedaży energii elektrycznej. Dzięki zastosowaniu technologii blockchain transakcje te mogłyby być w łatwy sposób przeprowadzane bezpośrednio pomiędzy wytwórcami oraz odbiorcami energii, co mogłoby prowadzić do częściowej decentralizacji w tym obszarze. Drugi zaproponowany przykład dotyczy śledzenia pochodzenia surowców energetycznych i pozwoliłby na przypisanie wytwarzanej energii elektrycznej niezmiennych atrybutów pochodzenia oraz parametrów wpływających na środowisko. Poprzez wprowadzenie takiego rozwiązania, możliwe byłoby skonstruowanie „śladu paliwowego” poszczególnych jednostek wytwórczych. W artykule przytoczono również przykłady innych potencjalnych zastosowań technologii blockchain w elektroenergetyce.

EN

Blockchain is a technology, which could revolutionize many industries in the future. A system like that is based on a chain of blocks that is used for storing and transferring various data, forming a decentralized ledger. Although various fundamental projects based on the blockchain system in the energy industry are in their early stage of development, as well as other solutions, applications of blockchain technology in the broadly understood power engineering sector are considered to have a very large potential. This paper presents a brief description of the blockchain technology, its general operating principle and the possibilities it brings. The next section of the article contains a characterization of two exemplary and possible blockchain technology applications, which in the perspective of time may have a significant impact on the power engineering sector. The first solution is related to carrying out energy transactions, which could be conducted in an easy way directly between energy producers and consumers. Thanks to blockchain technology, this could lead to a partial decentralization in that area. The second proposed example concerns energy resources origin tracking, which would allow fixed origin attributes and parameters affecting the environment to be assigned to the generated energy. By implementing that solution, it would be possible to construct a fuel footprint of individual generating units. The article also mentions examples of other potential applications of blockchain technology in the power engineering sector.

5

Virtual money for purchases in school shops and for educational applications: eZloty

Pawlak M., Guziur J., Poniszewska-Marańda A., Stolarek J.

Journal of Applied Computer Science

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2018

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Vol. 26, nr 2

147--160

EN

Recent developments in Polish legislation concerning the healthiness of products in schools shops and results of law compliance verification resulted in a need for a way to supervise purchases in school shops. In this article, a solution for this problem is presented in a form of an online payment platform utilizing virtual currency called eZloty. The platform is based on blockchain technology which allows storing transaction history in an immutable form. As a result, eZloty payment system would enable supervision of products bought in schools, thus creating a possibility for more directed actions promoting healthy food and compliance with ministry regulations.

6

Asynchronous information distribution and cluster state synchronization

Nabożny M.

Applied Computer Science

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2018

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Vol. 14, no 1

27--41

EN

This article describes issues related to information distribution and cluster state synchronization in decentralized environments with inconsistent net-work topology. The main objective of this study was to create a set of rules and functional requirements to build a fault-tolerant framework based on Blockchain for creating applications in decentralized and distributed en-vironments, regardless of the underlying cluster’s hardware.

7

Technologie Bitcoina w Internecie Rzeczy (IoT)?

Nowakowski W.

Elektronika : konstrukcje, technologie, zastosowania

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2015

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Vol. 56, nr 10

58-60

PL

Przedstawiono najnowsze zastosowania technologii łańcucha bloków stosowanej w systemie waluty wirtualnej Bitcoin w dziedzinach nie zwiazanych z obrotem walutowym.

EN

The newest application blockchain technology used in virtual currency Bitcoin system in areas not associated with financial operations.

8

Ethereum : rozwój zastosowań technologii Bitcoina

Nowakowski W.

Elektronika : konstrukcje, technologie, zastosowania

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2015

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Vol. 56, nr 12

63-66

PL

Zastosowanie technologii łańcucha bloków do platformy Ethereum, umożliwiającej zastosowanie tej technologii w wielu dziedzinach życia gospodarczego.

EN

The use of blockchain technology in the platform Ethereum, allowing the use of this technology in many areas.