Cryptography and Network Security
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Cryptography and Network Security is a vital subject in the 7th-semester Computer Science curriculum that introduces students to the fundamental concepts of securing information and communication systems. The course focuses on cryptographic principles, encryption techniques (both classical and modern), secure key distribution, authentication methods, and real-world security protocols.
Students will explore symmetric and asymmetric cryptography (e.g., DES, RSA, ECC), cryptographic hash functions, and protocols such as TLS, IP Security, and secure email mechanisms like S/MIME and PGP. Through theoretical learning and hands-on labs, the course prepares students to apply cryptographic techniques and analyze network security mechanisms used to safeguard digital communications in today's connected world.
A model for Network Security, Classical encryption techniques: Symmetric cipher model, Substitution ciphers-Caesar Cipher, Monoalphabetic Cipher, Playfair Cipher, Hill Cipher, Polyalphabetic Ciphers, One time pad, Steganography. Block Ciphers and Data Encryption Standards: Traditional Block Cipher structures, data Encryption Standard (DES), A DES Example, The strength of DES, Block cipher design principles.
Textbook: Chapter 1: 1.8 Chapter 3: 3.1, 3.2, 3.5 Chapter 4: 4.1, 4.2, 4.3, 4.4, 4.5
Pseudorandom number Generators: Linear Congruential Generators, Blum Blum Shub Generator. Public key cryptography and RSA: Principles of public key cryptosystems-Public key cryptosystems, Applications for public key cryptosystems, Requirements for public key cryptography, Public key Cryptanalysis, The RSA algorithm: Description of the Algorithm, Computational aspects, The Security of RSA. Diffie-Hellman key exchange: The Algorithm, Key exchange Protocols, Man-in-the-middle Attack, Elliptic Curve Cryptography: Analog of Diffie-Hellman key Exchange, Elliptic Curve Encryption/Decryption, Security of Elliptic Curve Cryptography.
Textbook: Chapter 8: 8.2 Chapter 9: 9.1, 9.2 Chapter 10: 10.1, 10.4
Applications of Cryptographic Hash functions, Two simple Hash functions, Key management and distribution: Symmetric key distribution using symmetric encryption, Symmetric key distribution using asymmetric encryption, Distribution of public keys, X.509 Certificates, Public Key Infrastructures
Textbook: Chapter 11: 11.1, 11.2 ,11.3 Chapter 14: 14.1, 14.2, 14.3, 14.4, 14.5
User Authentication: Remote user authentication principles, Kerberos, Remote user authentication using asymmetric encryption. Web security consideration, Transport layer security. Email Threats and comprehensive email security, S/MIME, Pretty Good Privacy. Textbook: Chapter 15: 15.1, 15.3, 15.4 Chapter 17: 17.1, 17.2 Chapter 19: 19.3, 19.4, 19.5
Domainkeys Identified Mail. IP Security: IP Security overview, IP Security Policy, Encapsulating Security Payload, Combining security associations, Internet key exchange. Textbook: Chapter 19: 19.9 Chapter 20: 20.1, 20.2, 20.3, 20.4, 20.5
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