TY BSc-IT - NS Unit 2 - Lec 1 - Symmetric Key Cryptography,Algo Types, algo modes

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