The book “Ensuring the confidentiality of information in telecommunication systems of internal affairs” by Kiselev is a fascinating and in-depth study that immerses the reader in the world of modern technologies and their impact on the security of data in the internal affairs bodies. With the rapid development of information technologies and an increase in the amount of information processed, the issue of privacy becomes especially relevant. Kiselev, with a wealth of experience in the field of telecommunications and information security, offers readers a unique look at ways to protect data used in law enforcement. This book will be of interest not only to specialists in the field of information technology and security, but also to students studying law, forensics and related disciplines. It will also attract the attention of practitioners of internal affairs who seek to improve their knowledge in the field of information security . The age range of readers ranges from undergraduates to law enforcement professionals, making the book a universal source of knowledge for anyone interested in data security. Kiselev raises important topics regarding the threats faced by telecommunications systems and methods of preventing them. It analyzes existing approaches to ensuring confidentiality, considers modern encryption and authentication technologies, and shares practical recommendations for their implementation. Readers will be able to learn about how to properly organize information protection, what are the risks and how to minimize them. The book is filled with examples from real practice, which makes the material more accessible and understandable. Kiselev's style can be described as popular science, which allows him to convey complex technical aspects to a wide audience. His previous work also focuses on security and information protection issues, and each of them differs in depth of analysis and practical focus. Readers familiar with the author's other works will appreciate his ability to combine theory and practice, making each page of the book useful and informative. The book “Ensuring the confidentiality of information in telecommunication systems of internal affairs” is not just a manual on data security; it is an important contribution to understanding how modern technologies can be used to protect the rights of citizens and ensure the rule of law. In the context of globalization and digitalization, when information becomes one of the most valuable resources, Kiselev’s work acquires special significance. He not only describes the existing problems, but also suggests ways to solve them, which makes the book relevant and timely. If you are looking for information on how to protect your data in the face of modern challenges, or want to deepen your knowledge in the field of telecommunications security, this publication will be a real find for you. The book will help you to understand the complex issues of privacy and security, as well as give practical advice that can be applied in real life. Do not miss the opportunity to get acquainted with the work of Kiselev - this is not only useful, but also a fascinating reading for everyone who is interested in the topic of information security .