This comprehensive course on Cryptography and Network Security provides a complete understanding of securing data and communications in computer networks. It begins with foundational concepts such as the CIA Triad, OSI Security Architecture, security attacks, services, and mechanisms, along with network security models.
Students explore classical encryption techniques including Caesar, Monoalphabetic, Playfair, Hill, and Polyalphabetic ciphers, as well as modern encryption standards such as DES, AES, and Triple DES. The course also covers advanced topics such as stream and block ciphers, block cipher modes (ECB, CBC, CFB, OFB, CTR), key scheduling, avalanche effect, and multiple encryption strategies.
Mathematical foundations are emphasized, including number theory, prime numbers, modular arithmetic, Euler’s theorem, GCD, Chinese Remainder Theorem, discrete logarithms, and pseudorandom number generation, which are critical for cryptographic security.
Additionally, learners gain knowledge of public key cryptography, hash functions, digital signatures, and practical system and web security practices. Real examples, demonstrations, and solved questions are included to reinforce learning and prepare students for practical applications in cybersecurity, ethical hacking, and secure network design.
