The book “Protection of Information in Telecommunication Systems” by Makarov is a fascinating and in-depth study that immerses the reader in the world of modern technologies and their vulnerabilities. With the rapid development of digital communications and the constant growth of cybersecurity threats, this work becomes not only relevant, but vital for all those interested in information protection. The author, known for his in-depth knowledge of information technology and cybersecurity, offers readers a unique perspective on issues related to data protection in telecommunications systems. The book covers a wide range of topics, ranging from the basics of cryptography to methods of preventing information leaks. Makarov shares not only theoretical knowledge, but also practical recommendations, which makes his work valuable for both students and professionals in the field of IT. This book will be of interest not only to specialists and students of technical universities, but also to everyone who wants to understand more deeply how telecommunication systems function and what threats can lie in wait for them. It is suitable for both young professionals seeking to build a career in the field of cybersecurity, and for more experienced professionals who want to update their knowledge and get acquainted with the latest trends in the field of information security. The topics raised in the book are relevant to modern society, where information has become one of the most valuable resources. Makarov discusses the importance of protecting personal data, corporate information and state secrets, and also considers the consequences of data leaks and cyber attacks. Readers will be able to learn about information security techniques such as encryption, authentication and access management, as well as new approaches to security in the face of growing threats. Makarov's style is distinguished by clarity and accessibility of presentation, which allows the reader to easily assimilate complex concepts. He masterfully combines theory with practical examples, which makes reading not only informative, but also fascinating. In his works, one can notice the desire to systematize knowledge and present them in a logical sequence, which is especially important for understanding complex topics. In addition to “Information Protection in Telecommunication Systems”, Makarov is the author of several other significant works on information technology and security. His books are often recommended as teaching aids in universities and refresher courses. Readers interested in topics such as "Cybersecurity for Beginners" or "Data Protection Fundamentals" will find much useful information in his work. Thus, “Information Protection in Telecommunication Systems” is not just a book, but a whole world of knowledge that will help readers understand the complex issues of cybersecurity and information protection. It will become a reliable assistant for anyone who wants to be one step ahead in the fight against cyber threats and protect their data in the digital age. If you are looking for a source of inspiration and knowledge in the field of information security, this work must take its rightful place on your shelf.