Pros and Cons of Cryptography, Steganography and Perturbation techniques

Cryptology was as significant as weapons during the World War II and the Cold War. There were lots of studies to develop robust crypto-systems and to use them in communications. These studies have continued up to now. Today some of those crypto-systems called as “classical crypto-systems” are improved and still being used. Mostly we can secure our data in three ways first one is cryptography where content of the message is kept secret by encoding it, secondly Steganography where the message is embedded in another medium, third perturbation technique which performs some operation on actual data so that its actual meaning is not obvious/disclosed.Here we have a comparative study on cryptography, steganography and perturbation technique with pros and cons of each.