A Comparative Study of Various image Steganographic Techniques Used for Information Hiding
Keywords:
Steganography, image steganography, spatial domain, Transform domainAbstract
The staggering growth in communication technology and usage of public domain channels (i.e. Internet) has greatly facilitated transfer data. However, such open communication channels have greater vulnerability to security threats causing unauthorized information access. Traditionally, encryption is used to realize the communication security. Today HTML pages and Spam Emails are also being used for steganography. With the help of steganography we can hide the information which is paramount and confidential for us. Steganography is the art of hiding the fact that communication is taking place, by hiding information in other information. Many different carrier file formats can be used. For hiding secret information in images, there exist a large variety of steganographic techniques some are more complex than other and all of them have respective strong and weak points. Steganography is a technology where modern data compression, information theory, spread spectrum, any cryptography technologies are brought together to satisfy the need for privacy on the internet. This paper intends to give through understanding and evolution of different existing image steganographic techniques of data hiding in spatial, transform and compression domains. It also discusses that which image format is most appropriate or best for our algorithm and how can we perform compression on that.
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