UNIT-1  Security Services, Mechanisms and Attacks, Α Model for Internetwork security, Classical Techniques Conventional Encryption model. Steqanoqraphy. Classical Encryption Techniques.  Modern Techniques : Simplified DES. Block Cipher Principles. Data Encryption standard. Strenqth of DES. Block Cipher Desiqn Principles. (Chapter - ι)  UNIT-11  Encryption : Triple DES. International Data Encryption alqorithm. Blowfish. RC5. Characteristics of Advanced Symmetric block Ciphers. Placement of Encryption function. Traffic confidentiality, Key distribution. Random Number Generation. (Chapter - 2)  UNIT-111  Public Key Cryptography : Principles. RSA Alqorithm. Key Manaqement. Diffie-Hellman Key exchanqe. Elliptic Curve Cryptoqrapy.  Number Theory: Prime and Relatively prime numbers. Modular arithmetic. Fermat's and Euler's theorems. Testinq for primality, Euclid's Alqorithm, the Chinese remainder theorem, Discrete Ioqarithms. (Chapter - 3)  UNIT-IV  Message Authentication and Hash Functions : Authentication requirements and functions. Messaqe Authentication. Hash functions. Security of Hash functions and MACs.  Hash and Mac Algorithms : MD-5. Messaqe diqest Alqorithm. Secure Hash Alqorithm.  Di!Jital siqnatures and Authentication protocols : Diqital siqnatures. Authentication Protocols. Diqital siqnature standards.  Authentication Applications Kerberos, Electronic Mail Security, Pretty Good Privacy. SIME/MIME. (Chapter - 4)  UNIT-V  ΙΡ Security : Overview. Architecture. Authentication. Encapsulatinq Security Payload. Key Manaqement. Web Security : Web Security requirements. Secure sockets Iayer and Transport Iayer security, Secure Electronic Transaction.  lntruders, Viruses and Worms : Intruders. Viruses and Related threats.  Fire Walls: Fire wall Desiqn Principles. Trusted systems. (Chapter - 5)