The development of modern computer technologies endangers the confidentiality of information, which is usually ensured by traditional cryptographic means. This circumstance forces us to look for new methods of protection. In view of modern trends, quantum cryptography methods can become such alternatives, which allow solving a number of important cryptographic problems, for which the impossibility of solving using only classical (that is, non-quantum) communication has been proven. Quantum cryptography is a branch of quantum informatics that studies methods of protecting information by using quantum carriers. The possibility of such protection is ensured by the fundamental laws of quantum mechanics. One of the promising directions of quantum cryptography is Quantum Secure Direct Communication (QSDC) that offers secure communication without any shared key. A characteristic feature of this method is the absence of cryptographic transformations, accordingly, there is no key distribution problem. The purpose of this work is a general overview of quantum cryptography protocols, finding their weak points for further development and improvement, as well as identifying vulnerabilities to different attacks. The article analyzes new methods and protocols, as well as presents their advantages and disadvantages. Based on partial generalizations of theoretical provisions and practical achievements in the field of quantum cryptography, a generalized classification was developed. By comparing various factors of the protocols, and their resistance to certain cyberattacks, we have the opportunity to identify several problems in this field and expand the possibilities for choosing appropriate methods for building modern quantum information protection systems. In accordance with this, conclusions were presented regarding the use of protocols and increasing the level of their effectiveness.

The rapid development of unmanned aerial vehicles (UAVs), as well as the expansion of the list of actions performed by modern UAVs, led to increased requirements for the safety and reliability of data transmission. In the context of warfare, when confidential information is collected, the protection of such information is a top priority. The practical level of conducting aerial reconnaissance during current warfare demonstrates the urgent need to create UAV which capable of performing flight tasks and aerial reconnaissance in the mode of installed radio interference, and also emphasizes the importance of ensuring the data confidentiality about target objects transmitted by an optical channel for the implementation of their processing in automated systems. The paper provides a review and comparative analysis of modern cryptoalgorithms that are used to ensure data confidentiality during their transmission by radio channel from UAV to ground objects. There are the system of criteria (multi criteria analysis) was used to compare following cryptographic algorithms (similar to AES, NESSIE, etc competitions): block and key sizes; modes of operation; encryption speed; memory requirements; resistance (security) to cryptanalysis. The conducted analysis showed that each cryptographic algorithm has advantages and disadvantages. Also, there is no universal cryptographic algorithm that capable to resolve all privacy problems in UAV. According to the limited resources in the process of UAV operation, it is necessary to create a universal set (dataset) of cryptographic algorithms that could solve various problems in different conditions including different aspects of UAV exploitation. It is these studies that will be devoted to the further work of the authors within the framework of the ongoing scientific project.