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.