криптографія

The development of smart contracts in blockchain networks has enabled the creation of sophisticated decentralized finance (DeFi) protocols, encompassing decentralized exchanges, lending platforms, and algorithmic crypto-assets. Despite decentralization and transparency, blockchain networks do not guarantee a predictable transaction execution order, leading to the emergence of the phenomenon known as Maximal Extractable Value (MEV) – an additional profit extracted by certain network participants who influence transaction ordering.

This paper investigates the features of constructing and applying cryptographic protocols to protect unmanned aerial vehicles (UAVs) from cyberattacks.
Today, we witness a uniquely rapid development of military-purpose UAVs. This unprecedented growth is driven by the decisive influence of combat UAV characteristics on the outcomes of real military operations. Additionally, this development is based on the analyzed, documented, and recognized results of UAV usage in combat conditions.

Wireless MESH networks are important for providing communication in conditions where communication infrastructure is limited or absent. In such networks, encryption key management plays an important role in ensuring the security of data transmission. The work analyzes existing approaches to encryption key management in wireless networks and proposes a method for optimal key update. The method was tested on the LoRa EBYTE SX1262 chip with the ESP-WROOM-32. Algorithms for predicting update time were used.

The paper examines the problems of ensuring the authenticity of messages, as well as analyzes the modern requirements for hash functions and the problems of designing algorithms for calculating hash functions.

The advent of smart contract technology in blockchain networks has ushered in a new era of possibilities for implementing complex decentralized finance protocols. Over time, these protocols have gained significant traction, reaching a Total Value Locked (TVL) of over 150 billion US dollars. While blockchain networks offer inherent benefits such as immutability, transparency, decentralization, and security, they still grapple with a critical challenge – the inability to ensure a predictable order of transactions within produced blocks.

Cryptographic methods today are a crucial tool for constructing information security systems. At the same time, to solve the problem of encrypting large amounts of information, block or stream symmetric ciphers are mainly preferred because of their efficiency and proven cryptographic strength, including against perspective quantum cryptanalysis.

The goal of the publication is to test the random codes generator of the built-in crypto-protection system

Подано результати синтезу та дослідження генератора псевдовипадкових чисел на базі обчислювача кореня квадратного з простого числа. Показано, що такий генератор має добрі статистичні характеристики. Запропонований алгоритм обчислення функції кореня квадратного забезпечує високу швидкодію генератора.