Journal of Information and Organizational Sciences (JIOS)
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Complete SAT based Cryptanalysis of RC5 Cipher
No full textKeeping the proper security level of ciphers used in communication networks is today a very important problem. Cryptanalysts ensure a constant need for improvement complexity and ciphers' security by trying to break them. Sometimes they do not instantly try to break the strongest version of the cipher, but they are looking for weaknesses by splitting it and independently checking all algorithm components. Often cryptanalysts also attempt to break cipher by using its weaker version or configuration. There are plenty of mechanisms and approaches to cryptanalysis to solve those challenges. One of them is SAT-based method, that uses logical encoding. In this article, we present our wide analysis and new experimental results of SAT-based, direct cryptanalysis of the RC5 cipher. To perform such actions on the given cipher, we initially create a propositional logical formula, that describes and represents the entire RC5 algorithm. The second step is to randomly generate key and plaintext. Then we determine the ciphertext. In the last step of our computations, we use SAT-solvers. They are particularly designed tools for checking the satisfiability of the Boolean formulas. In our research, we make cryptanalysis of RC5 cipher in the case with plaintext and ciphertext. To get the best result, we compared many SAT-solvers and choose several. Some of them were relatively old, but still very efficient and some were modern and popular
From the Editor
No full textDear readers,
As the new editor, in the beginning I would like to thank former editor dr. Dijana Oreški for her efforts to improve the Journal in the quality of the papers, visibility and recognition in the scientific society. This Journal has been continuously published for 43 years, and yet, improvements are possible. Such a tradition demands severity in work and devotion in efforts. And I hope that I will be, as a new editor, on the level for these tasks.
The Journal could not exist without the thoughtful leading, for which I thank all previous editors, without hard work in selecting papers, for which I am thankful to all members, current and previous, of the editorial board, keeping the quality of the papers on the high level, which is the merit of our reviewers, the work on the design and layout of the Journal, which is in the continuous process of improvement, thanks to publishing board. The Journal could not exist without the content, the papers. Therefore, I want to thank all authors that, in 43 years, recognized our Journal as an adequate place to publish their scientific results.
All this work must go on. Therefore, I am proud to present the new issue of the Journal containing 10 high quality papers from the authors from Europe, Asia and Africa. Three continents authors come from justify the status of internationality of the Journal and assure us that we are still on the right track. Among the papers we have seven original scientific papers, two survey papers and one preliminary communication. I hope that readers will enjoy reading this issue and that they will find papers presented in it inspiring for their future research.
Alen LovrenčićEdito
A Comparison of Approaches for Measuring the Semantic Similarity of Short Texts Based on Word Embeddings
No full textMeasuring the semantic similarity of texts has a vital role in various tasks from the field of natural language processing. In this paper, we describe a set of experiments we carried out to evaluate and compare the performance of different approaches for measuring the semantic similarity of short texts. We perform a comparison of four models based on word embeddings: two variants of Word2Vec (one based on Word2Vec trained on a specific dataset and the second extending it with embeddings of word senses), FastText, and TF-IDF. Since these models provide word vectors, we experiment with various methods that calculate the semantic similarity of short texts based on word vectors. More precisely, for each of these models, we test five methods for aggregating word embeddings into text embedding. We introduced three methods by making variations of two commonly used similarity measures. One method is an extension of the cosine similarity based on centroids, and the other two methods are variations of the Okapi BM25 function. We evaluate all approaches on the two publicly available datasets: SICK and Lee in terms of the Pearson and Spearman correlation. The results indicate that extended methods perform better from the original in most of the cases
Security Challenges Behind the Development and Increased Use of Open Source Web Content Management Systems
No full textNowadays the IT market is enriched with free Open Source Web Content Systems offers that are available to all users. No system is perfect, and some of them have better solutions in one segment but are more vulnerable in others and vice versa, all in order to be more user-friendly. The most common form of Content Management System (CMS) implemented on the Internet today is the Web Content Management System(WCMS). This solution includes numerous advantages for site administrators as well as communication with the site designer for all users in order to improve the content, through written remarks, opinions and evaluations of the site content, resulting in a more dynamic and interactive site. This modern approach offers users with a poor IT background the opportunity to be independent and creative in creating their own website. In this paper we present data collected from several websites monitored for various cyber-attacks. Moreover, we will describe and analyze security challenges that follow cyber-attacks. During the monitoring process we followed 15 web addresses over a period of nine months and collected 520 reports of various cyber-attacks. The following analysis presents the different kinds of attacks, their frequency and some of the ways to reduce cyber-attacks to the lowest possible level
Controlled DDoS Attack on IPv4/IPv6 Network Using Distributed Computing Infrastructure
No full textThe paper focuses on design, background and experimental results of real environment of DDoS attacks. The experimental testbed is based on employment of a tool for IT automation to perform DDoS attacks under monitoring. DDoS attacks are still serious threat in both IPv4 and IPv6 networks and creation of simple tool to test the network for DDoS attack and to allow evaluation of vulnerabilities and DDoS countermeasures of the networks is necessary. In proposed testbed, Ansible orchestration tool is employed to perform and coordinate DDoS attacks. Ansible is a powerful tool and simplifies the implementation of the test environment. Moreover, no special hardware is required for the attacks execution, the testbed uses existing infrastructure in an organization. The case study of implementation of this environment shows straightforwardness to create a testbed comparable with a botnet with ten thousand bots. Furthermore, the experimental results demonstrate the potential of the proposed environment and present the impact of the attacks on particular target servers in IPv4 and IPv6 networks
Use of Internet Social Networks in Academic Environment
No full textNumerous national and private Slovak universities and colleges are currently confronted with a state, where the offer of study programmes exceeds its demand-students' interests. This paper describes reasons for this situation but mainly it points out the fact that the advent of information and communication technologies significantly intervened in different areas of life and all types of communication. The implementation of some tools of internet social networks in the academic environment is, therefore, essential. In addition to the theoretical background, the paper also includes case study related to the creation of a new Facebook profile #MaŠtu, setting up specific online marketing key performance indicators (KPI) and monitoring them using both Facebook analytics metrics and the social networking tool for administration, ZoomSphere
Publication Ethics; List of Reviewers; Instructions for Authors
No full textFull text available in PDF. 
Does Cloud-Based Accounting Information System Harmonise the Small Businesses Needs?
No full textCloud technology is now becoming a valuable resource, as it provides cost-saving business technology. Businesses exist to earn a profit by keeping their capital and expenses low. In an attempt to address the issue, this study employs structural equation model to complement literature on users' technology acceptance behavior. The framework of the study was based on the technology acceptance model (TAM) to better understand the adoption of cloud computing by small businesses owners. This study looks at the perception and attitudes of small businesses (SMEs) towards cloud technology based accounting information systems, therefore, their intention to adopt the technology. Result support the view that perceived usefulness, ease of use and credibility positively influenced SMEs' attitudes towards cloud-based accounting information systems and therefore their intention to adopt the technology. The result enhances literature in the field of cloud-based accounting systems for small businesses
Help me TripAdvisor! Examining the relationship between TripAdvisor e-WOM attributes, trusts towards online reviews and travellers’ behavioural intentions
No full textThis paper aims to examine the impact of TripAdvisor reviews on behavioural intentions, basing on travellers' trust towards the e-WOM reviews. Four factors are proposed for building travellers’ trust and behavioural intentions: information quality, credibility, adoption and usefulness. Trust is expected to mediate the relationship between eWOM attributes and travellers’ behavioural intention. Data from 410 travellers were analysed using Partial Least Square-Structural Equation Modeling (PLS-SEM), and the findings show that TripAdvisor e-WOM attributes (information credibility, adoption and usefulness) significantly influence the traveller's trust. Besides, traveller behavioural intention was influenced considerably by TripAdvisor eWOM information credibility and usefulness. Lastly, trust in e-WOM significantly mediates travellers' behavioural intention. This paper confirms the importance of eWOM in the context of the tourism industry and travellers' trust and behaviour towards online review, which altered how consumers behave before deciding to travel
