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SYLLABUS

Unit-I

Computer Security Concepts, The OSI Security Architecture, Security Attacks, Security Services and Security Mechanisms, A Model for Network Security. Classical Encryption Techniques – Symmetric Cipher Model, Substitution Ciphers, Transposition Ciphers, Steganography. Modern Block Ciphers: Block Ciphers Principles, Data Encryption Standard (DES), Strength of DES, Linear and Differential Cryptanalysis, Block Cipher Modes of Operations, AES, RC4.

Unit-II

Introduction to Number Theory – Integer Arithmetic, Modular Arithmetic, Matrices, Linear Congruence, Algebraic Structures, GF(2n ) Fields, Primes, Primality Testing, Factorization, Chinese Remainder Theorem, Quadratic Congruence, Exponentiation and Logarithm. Public-key Cartography – Principles of Public-key Cryptography, RSA Algorithm, Diffie-Hellman Key Exchange, ELGamal Cryptographic System, Elliptic Curve Arithmetic, Elliptic Curve Cryptography.

Unit-III

Cryptographic Hash Functions: Applications of Cryptographic Hash Functions, Requirements and Security, Hash Functions Based on Cipher Block Chaining, Secure Hash Algorithm (SHA). Message Authentication Codes: Message Authentication Requirements, Message Authentication Functions, Requirements for Message Authentication Codes, Security of MACs, HMAC, MACs Based on Block Ciphers, Authenticated Encryption. Digital Signatures – RSA with SHA and DSS.

Unit-IV

Key Management and Distribution: Symmetric Key Distribution Using Symmetric Encryption, Symmetric Key Distribution Using Asymmetric, Distribution of Public Keys, X.509 Certificates, Public Key Infrastructure. User Authentication: Remote User Authentication Principles, Remote User Authentication Using Symmetric Encryption, Kerberos, Remote User Authentication Using Asymmetric Encryption, Federated Identity Management, Electronic Mail Security: Pretty Good Privacy (PGP), S/MIME.

Unit-V

Security at the Transport Layer (SSL and TLS) : SSL Architecture, Four Protocols, SSL Message Formats, Transport Layer Security, HTTPS, SSH. Security at the Network Layer (IPSec): Two Modes, Two Security Protocols, Security Association, Security Policy, Internet Key Exchange. System Security: Description of the System, Users, Trust and Trusted Systems, Buffer Overflow and Malicious Software, Malicious Programs, Worms, Viruses, Intrusion Detection System (IDS), Firewalls.