Cryptographic protection of information in telecommunication systems : educational and methodological manual for students of specialties "C" by Vladimir Fedorovich Golikov is an important and relevant work that will be of interest to both students and specialists in the field of information technology and telecommunications . With the rapid development of digital technologies and increasing threats to data security, this manual is becoming an indispensable source of knowledge for anyone who wants to understand the intricacies of cryptographic information protection. The book focuses on methods and technologies that ensure the security of data transmission in telecommunications systems. The author examines in detail the basic principles of cryptography, ranging from historical aspects to modern encryption algorithms. Golikov masterfully explains complex concepts, making them understandable even to those who are just starting their way in this area. The reader will be able to learn about various types of encryption, such as symmetric and asymmetric, as well as about the protocols that are used to protect information in networks. This book will be of interest not only to students of technical specialties, but also to everyone who is interested in issues of Internet security, personal data protection and information technology in general. It is suitable for both novice professionals and experienced professionals who want to update their knowledge and get acquainted with the latest achievements in the field of cryptography. If you study at the Faculty of Information Technology, Computer Science or Telecommunications, this manual will become a reliable assistant in your studies for you. The topics raised in the book cover a wide range of issues, including authentication methods, digital signatures, key management, and attack protection. Golikov emphasizes the importance of cryptographic protection in modern conditions, when cyber threats are becoming more sophisticated. The reader will be able to understand how to correctly select and apply cryptographic methods depending on the specifics of the tasks and security requirements. The author’s style is distinguished by clarity and logical presentation . Golikov uses many examples and tasks that help to consolidate theoretical knowledge in practice. The book is written taking into account modern realities and trends in the field of information security, which makes it especially valuable for students and practitioners. In addition, Vladimir Fyodorovich Golikov is a well-known specialist in the field of cryptography and information security, and his work has already established itself as an authoritative source. If you are familiar with his other works, such as “Basics of cryptography” or “Security of information systems”, then this guide will be a logical continuation of your study of the topic. In conclusion, “Cryptographic protection of information in telecommunications systems” is not just a textbook, but a real find for anyone who wants to understand more deeply how data is protected in the modern world. This book will be your reliable companion in the study of cryptography and will help you become a qualified specialist in the field of information security. Do not miss the opportunity to get acquainted with this important work and expand your knowledge in one of the most relevant and popular areas of science!