Lecture Notes for UNIT-2  DES  and   AES-BLOWFISH- CAST-128
If you have any queries please post or comment immediately. I will try to clarify immediately or next day's class. Do not feel shy.

NPTEL Videos for Cryptography and Network Security

Unit-I - Cryptography and Network Security

All the Students are requested to submit Assignment-1 on or before 14-07-2017 with out fail.
Assignment-1 and date : 05-07-2017.
1. Why and where do format string vulnerabilities exists? How are they fixed.
2. Explain in detail about security services and security attacks with the help of neat diagrams.
3. Explain in detail about substitution techniques with the help of suitable examples.

Math in Network Security: A Crash Course

About Hill Cipher Method

Hill Cipher || With 3x3 Matrix Multiplicative Inverse Example in Mod 26