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BCA-208N · Computer Networks
Unit 5

Network Security, Cryptography & Secure Protocols

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Unit 5 Learning Hub

Network Security, Cryptography & Secure Protocols

Official MJPRU BCA Unit 5: Network Security, Cryptography & Secure Protocols for BCA-208N (Computer Networks).

Syllabus Topics:Network Security Fundamentals: Security Goals (Confidentiality, Integrity, Availability - CIA Triad), Non-Repudiation, AuthenticationThreats and Cyber Attacks: Passive Attacks (Eavesdropping, Traffic Analysis) vs Active Attacks (Masquerade, Replay, Modification, Denial of Service - DoS/DDoS)Cryptography Basics: Plaintext, Ciphertext, Encryption, Decryption, Kerckhoffs's PrincipleSymmetric-Key (Secret-Key) Cryptography: Principles, Advantages, Shared Secret Distribution Problem, DES, Triple-DES, Advanced Encryption Standard (AES)Asymmetric-Key (Public-Key) Cryptography: Key Pairs (Public Key, Private Key), Mathematical Trapdoor Functions, RSA AlgorithmMessage Authentication & Integrity: Cryptographic Hash Functions (MD5, SHA-256), Collision Resistance, Message Authentication Codes (MAC / HMAC)Digital Signatures: Signing with Private Key, Verification with Public Key, Non-Repudiation Proof, Digital Certificates (X.509 Standard, Certificate Authority - CA)Key Management & Distribution: Public Key Infrastructure (PKI), Diffie-Hellman Key Exchange Algorithm (Discrete Logarithm Problem)Network Layer Security - IP Security (IPSec): Architecture, Authentication Header (AH), Encapsulating Security Payload (ESP), Transport Mode vs Tunnel ModeTransport Layer Security (TLS / SSL): Handshake Protocol, Record Protocol, HTTPS (Port 443), Securing Web TransactionsApplication Layer Security: Pretty Good Privacy (PGP) for Email Security (Confidentiality, Authentication, Compression, Radix-64 Conversion)Perimeter Defense: Firewalls (Packet Filtering Firewalls, Stateful Inspection Firewalls, Application Proxy Firewalls), Virtual Private Networks (VPNs - IPsec/SSL VPNs)
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Introduction to Computers & The IPO Cycle

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Topic 1 · The foundation of modern computing

Introduction to Computers & The IPO Cycle

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Ready to master this concept? Give it a quick read & tap the check!

💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
  • ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
  • ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
  • ·Hardware is what you can touch; Software is the instructions running inside.
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Which of the following represents unprocessed raw facts?

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