In this age of universal electronic connectivity, of viruses and hackers, of electronic eavesdropping and electronic fraud, there is indeed no time at which security of information does not matter. The explosive growth of computer systems and their interconnections via networks has increased the dependency on the information stored and communication using these systems. This has led to a heightened awareness of the need to protect the data transmitted.
Thus the field of cryptography has got more attention nowadays. More and more complex techniques for encrypting the information are proposed every now and then. Some advanced encryption algorithms like RSA, DES; AES etc. which are extremely hard to crack have been developed. But, as usual, when a small step is made to improve the security, more work is done in the opposite direction by the hackers to break it. Thus they are able to attack most of these algorithms and that too, successfully. Even complex algorithms like RSA are no exception to this.
So, to deceive the hackers, people have started to follow a technique called ‘Steganography’. It is not an entirely new technique and has been in the practice from ancient times. In this method, the data is hidden behind unsuspecting objects like images, audio, video etc. so that people cannot even recognize that there is a second message behind the object. Images are commonly used in this technique.