Study of different cryptographic technique and challenges in future

In the recent years the need of security has increased many folds. It's not that the need to secure data is new and goes back to the time of 1st and 2nd world war and even back to the time of Caesar. This paper gives a history of all the data hiding techniques used in the history and how these techniques have evolved from Caesar cipher to DES and then to Triple-DES, AES and current algorithms. This paper will explain the pros and cons of previous algorithms and why they are not used now a day. The scope of this paper will go from general data hiding techniques and then moves to cryptographic algorithms.