The book "Theoretical and Numerical Methods in Cryptography" by Alexei Yurievich Nesterenko is a fascinating and deep immersion in the world of cryptography, which will become an indispensable assistant for students, graduate students and anyone interested in modern methods of information protection. With the rapid development of technology and the increase in the amount of data transmitted, security issues are becoming especially relevant, and this manual offers readers not only theoretical foundations, but also practical applications of numerical methods in cryptography. The book begins with the basics of number theory, which allows the reader to gradually immerse himself in complex concepts. Nesterenko masterfully explains how numerical methods are used to create and analyze cryptographic algorithms. It not only expounds the material, but also emphasizes the importance of understanding the mathematical foundations, which allows readers to better understand how encryption systems work and what vulnerabilities may arise in the process of using them. A feature of this manual is its accessibility to a wide audience .. Despite the complexity of the subject, Nesterenko uses a clear and understandable language, which makes the book suitable not only for specialists in mathematics and computer science, but also for those who are just beginning to get acquainted with cryptography. Students of technical specialties, graduate students, as well as IT specialists will find in it a lot of useful information that will help them not only in their studies, but also in their professional activities. The topics covered in the book cover a wide range of topics, from simple ciphers to modern algorithms such as RSA and ECC. Nesterenko pays attention to both theoretical aspects and practical examples, which allows readers not only to understand, but also to apply the knowledge gained in practice. It also addresses security issues, vulnerabilities, and methods of attacking cryptographic systems, making the book relevant for information security professionals. The book “Theoretical Numerical Methods in Cryptography” will be a real discovery for those who want to deepen their knowledge in the field of information security. It raises important questions about how modern technologies can be used to ensure data security, and how mathematical methods can help in this process. Nesterenko not only shares his knowledge, but also inspires readers to further explore this fascinating and important area. The style of the author is clear and logical, which makes it easy to follow the course of thought and assimilate even the most complex concepts. Alexey Yurievich Nesterenko is a well-known specialist in the field of cryptography and number theory, and his previous works have also received recognition in the scientific community. His experience and in-depth knowledge in this area make this book not only a textbook, but also a real reference for anyone who wants to stay at the forefront of security technology. If you are looking for a book that will help you understand the theoretical and numerical methods of cryptography, "Theoretical and Numerical Methods in Cryptography Tutorial" will be your reliable companion in this fascinating journey. Do not miss the opportunity to expand your horizons and gain valuable knowledge that may prove decisive in your career or study.