A Comparative Study of Various Lossless Compression Techniques of Steganography and Cryptography

Data transaction is increasing day by day over internet which is resulting into a great challenge of their security. Data security had been a great matter of concern for which different technique like steganography, cryptography came into picture. These techniques are used to convert the data into unreadable format so that it can be protected from any kind of attack. However, the attackers are also updating themselves. Thus, the combination of various compression techniques has been implemented for higher security. In this paper, a study of various stenographic compression technique and combination of steganography and cryptography methods are reviewed and discussed in detail. The result of the analysis of various ideas helps in proposing a more complex and secure method. We come to a solution that, the combination of Huffman compression technique along with other compression technique and Cryptography is best suited for higher secrecy of data and less distortion in stegno image. Elliptical curve cryptography or public-key cryptography is also proposed for the better encryption of data and secrecy of key as well.