AKTU Cryptography and Network Security (BCS072) Notes & Study Material PDF – B.Tech 4th Year Sem 7

Complete and exam-oriented Cryptography and Network Security notes for AKTU B.Tech 4th Year Semester VII. Covers all 5 units with detailed concepts, cryptographic algorithms, network security protocols, diagrams, solved numericals, important questions, model answers, AKTU-pattern sample paper and quick revision material.

This comprehensive study material is designed for Computer Science, Computer Engineering, CSE and allied branches and follows the AKTU 2025–26 syllabus. The PDF contains 168 pages of structured, topic-wise study material.

🎓 Course Details

• Subject: Cryptography and Network Security
• Course Code: BCS072
• Year: 4th Year
• Semester: VII
• Session: 2025–26
• Credits: 3
• Course Type: Departmental Elective-IV
• Branches: CSE / Computer Science / Computer Engineering / Allied Branches

📚 Complete 5-Unit Coverage

🔹 UNIT I – Security & Classical/Modern Block Ciphers

Covers:

• Security Attacks
• Security Services & Mechanisms
• Model for Network Security
• Substitution Ciphers
• Transposition Ciphers
• Cryptanalysis
• Brute-Force Attacks
• Steganography
• Stream & Block Ciphers
• Shannon's Confusion & Diffusion
• Feistel Structure
• DES
• Differential Cryptanalysis
• Block Cipher Modes
• Triple DES

🔹 UNIT II – Number Theory, AES & Public-Key Cryptography

Includes:

• Groups, Rings & Fields
• Finite Fields GF(p)
• Modular Arithmetic
• Prime & Relatively Prime Numbers
• Extended Euclidean Algorithm
• Polynomial Arithmetic
• AES
• AES Encryption & Decryption
• Fermat's & Euler's Theorems
• Primality Testing
• Chinese Remainder Theorem
• Discrete Logarithm Problem
• Public-Key Cryptosystems
• RSA Algorithm
• RSA Security

🔹 UNIT III – Authentication, Hash Functions & Digital Signatures

Topics include:

• Message Authentication Requirements
• Authentication Functions
• Message Authentication Codes (MAC)
• Hash Functions
• Birthday Attacks
• Secure Hash Algorithm (SHA)
• HMAC
• Digital Signatures
• ElGamal Digital Signature
• Digital Signature Standard (DSS)
• Digital Signature Algorithms

🔹 UNIT IV – Key Management, Kerberos & Email Security

Covers:

• Symmetric Key Distribution
• Diffie-Hellman Key Exchange
• Public-Key Distribution
• X.509 Certificates
• Public Key Infrastructure (PKI)
• Kerberos
• Kerberos Message Exchanges
• PGP
• PGP Operations
• S/MIME
• Key Management Lifecycle
• PGP vs S/MIME

🔹 UNIT V – IP Security, SSL/SET & System Security

Includes:

• IP Security Architecture
• Authentication Header (AH)
• Encapsulating Security Payload (ESP)
• Security Associations
• IPSec Key Management
• SSL & TLS
• Secure Electronic Transaction (SET)
• Intrusion & Intrusion Detection Systems
• Viruses & Related Threats
• Firewalls

⭐ What You Get

✅ 168 Pages Complete Study Material
✅ Complete 5-Unit Coverage
✅ Topic-wise Detailed Notes
✅ Cryptographic Algorithms & Protocols
✅ Diagrams & Illustrations
✅ Solved Numericals
✅ Important Questions
✅ Model Answers
✅ Additional Solved Technical Problem Bank
✅ AKTU-Pattern Sample Question Paper
✅ Exam Pattern & Unit-wise Analysis
✅ Quick Revision Concept Sheet

The PDF includes a dedicated AKTU-pattern sample paper, model answers, additional solved technical problems, exam-pattern analysis and quick revision material.