TY BSc-IT NS Unit 2 Lecture 1: Symmetric Key Cryptography & Algorithms Explained 🔐

The point discussed in this lecture:-

Q-1) Explain Symmetric Key Cryptography with diagram.
Disadvantages of symmetric key:
Q-2) Explain Algorithm Types
2.1. Stream cipher
2.2. Block Cipher
Q-3) CONCEPTS OF CONFUSION AND DIFFUSION.
Q-4) What is algorithm modes?
4.1. Electronic Code Book (ECB) Mode
4.2. Cipher Block Chaining (CBC) Mode
4.3. Cipher Feedback Mode (CFB) & concept of IV in CFB mode
4.4. Output Feedback (OFB) Mode
4.5. Counter (CTR) Mode

Download NS Unit 1 notes from here:-
https://drive.google.com/open?id=0B_0qcYrYEFTBTWN2U3V3NGNhbGc

All other material by me @ this link:-
https://drive.google.com/open?id=0B_0qcYrYEFTBWjVtbS0ydjJ1REU

TYBScIT - Sem 5 - Paper Solutions from the year Oct'2012 - April'2017
https://drive.google.com/folderview?id=0B8LpZ5SvGPwrZ2RYckJ2OEpSMk0