Complexity and Cryptography

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This textbook provides a comprehensive introduction to cryptography, covering fundamental concepts, techniques, and applications. It explores various encryption methods, key management, and the mathematical principles underlying secure communication. Designed for beginners, the text includes practical examples and exercises to reinforce learning. Additionally, it discusses the importance of cryptography in modern security systems and its role in protecting data integrity and confidentiality. Ideal for students and professionals seeking to understand the essential elements of cryptographic practices.