NETWORK SECURITY AND CRYPTOGRAPHY (PE – IV) B.Tech. IV Year I Semester JNTUH R-18

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Unit I: Security Services, Mechanisms, and Attacks

Explain the fundamental concepts of network security and its importance in today's world.
Describe the OSI security model and how it defines different security services.
Compare and contrast classical encryption techniques like substitution and transposition with modern block ciphers.
Analyze the strength and weaknesses of DES algorithm and explain the rationale behind Triple DES.
Discuss the principles of block cipher design and the various factors to consider.

Unit II: Encryption

Implement data encryption and decryption using various algorithms like Blowfish, RC5, and AES.
Explain the role of key distribution in symmetric encryption and discuss different key management approaches.
Analyze the trade-offs between confidentiality, performance, and complexity when choosing an encryption algorithm.
Discuss how encryption can be used to ensure traffic confidentiality in network communication.

Unit III: Public Key Cryptography

Explain the principles behind public key cryptography and its advantages over symmetric encryption.
Implement the RSA algorithm for encryption and decryption and explain the importance of key management.
Analyze the vulnerabilities of Diffie-Hellman key exchange and discuss alternative key agreement protocols.
Explain the concepts of number theory and their applications in public key cryptography.

Unit IV: Message Authentication and Hash Functions

Describe the requirements and functions of message authentication in network security.
Explain the working principle of hash functions and how they can be used for message integrity verification.
Analyze the security properties of different hash functions like MD5 and SHA and discuss their vulnerabilities.
Design and implement digital signatures using RSA or other public key techniques.
Explain the principles of Kerberos authentication protocol and its applications in distributed systems.
Analyze the security features of Pretty Good Privacy (PGP) and S/MIME for email security.

Unit V: IP Security and Web Security

Describe the architecture of IP Security (IPsec) and its core protocols like AH and ESP.
Explain how authentication and key management are implemented in IPsec.
Analyze the principles of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) for secure web communication.
Discuss the vulnerabilities of web applications and the threats posed by intruders, viruses, and worms.
Design and implement firewall rules based on different security principles.