International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Digital cryptocurrencies especially privacy-oriented cryptocurrencies over the past years have experienced significant growth in terms of usage. The increased usage of privacy-oriented cryptocurrencies due to the offered privacy and anonymity, allows a cybercriminal to commit illegal transactions that are harder to trace back than Bitcoin. In this paper, we provide a forensic overview of the privacyoriented cryptocurrencies Monero, Verge, Dash, and Zcash. We analyse forensics experiments with these cryptocurrencies and make some assumptions and conclusions related to the analysed experiments.

Giving the right access, limiting resources, and recognizing a user’s identity are important steps that need to be taken into consideration before entering a certain network. These steps are executed by authentication and authorization. In this paper, we put our focus on authentication algorithms HOTP and TOTP as two algorithms for generating one-time passwords. A one-time password is an automatically generated string of characters – a password that is meant to be used only once. This password is only valid for one login session or transaction. Due to its randomness and usage (only once), it leads to higher security outputs, and that is why this type of password is used in authentication algorithms. We will analyse both algorithms and their working way and will present the obtained results and their usage in practice. The main characteristic is that the HOTP algorithm uses only hash functions and the TOTP algorithm uses time above the hash. To check when each algorithm is better to use, we need to know the given environment and circumstances. In this paper, we will try to answer the question” Which one is better at a particular time?”. Depending on many factors that we analyse through the sections, we are going to make conclusions that will be useful for future planning of good security passwords.

The e-cash methodology has its advantages compared to other payment systems and it has brought big changes to the way business is being conducted. Money becomes an intangible item and travels electronically across the world in a widely open network that might expose it to risks. This means that secure end-to-end connections are needed and many different cryptographic algorithms are used to achieve it. In this paper we will go through the main metrics that characterize them and the main properties of the e-cash system. Finally, a review of a compact e-cash scheme with practical and complete tracing will be given.

The Information Technology security threats are emerging with each day passing by. The implementation of the technology into every field of society brings changes. Finding a way to manage these changes would be a success, and, by doing so, it would mitigate the risks they bring. Data transmission nowadays is unsecure like never before. Challenging is the way that should be found to cope with these kinds of evolutionary changes. Among the top threats in networks lies the DoS attack. It has been a long time since this kind of attack is around, but that doesn’t reduce the fact that this type of attacks is still dangerous and devastating. In order to cope with this kind of attack, we need to know how to manage risks and changes during a DoS attack. Because of this, it is very important that defensive mechanisms are implemented and integrated so that unauthorized access would be prevented from accessing your network or data. This refers to individuals and everyone else working in companies that are working in the field of IT, because at some point, we all share the same thing-devices (mobile phones, personal computers, devices at work, etc.). The base of the IT foundation is knowing how to protect yourself and your data. Due to this, we need to work hard and exploit every possible threat and attack from the inside out. Not only to reduce or mitigate the already occurred impact, but also to prevent these types of failures from happening in the future.

BlockChain is a distributed database of records or public ledger of all time stamped transactions saved in all computers in one peer-to-peer network. It allows a secure and transparent transfer of digital goods including money and intellectual property. Bitcoin – a digital decentralized cryptocurrency, is the first application of BlockChain. The second application is an agreement called Smart contract that enables exchanging a value or assets between two owners based on a set of conditions included in the contract.

In this paper, we analyze the possibilities for application of BlockChain in Big Data and IoT. Implementation of BlockChain in Big Data confirms that data is accurate and secure and sharing of data will become more simple. In industries like financial services, government and healthcare there is a need to combine BlockChain and Big Data because these industries have repositories full of important data. They must store and share these large amounts of data. Implementation of BlockChain technology provides security of data and ensures its integrity when shared. BlockChain technology is also seen as a way to secure the Internet of Things (IoT). Application of BlockChain in IoT enables IoT devices to participate in BlockChain transactions and invents new styles of digital interactions. This technology will provide a simple infrastructure for devices to directly and securely transfer data or money using Smart contract.