A Comparative Evaluation of Jpeg Steganography

With the dependency on internet and smart gadgets, security of data has become a major concern. Steganography is one of the methods adopted to enhance the security of data by hiding it behind some cover which can be any amongst text, image, audio or video. Images are the most preferred medium to apply steganography as it contains large amount of redundant data. Image steganography hides the data behind the image in a manner that alterations are hardly noticeable to human eye. Images are available in different formats, out of which jpeg images have become the most popular image format due to its small size. These images undergo lossy compression resulting in small sized images, but hiding data behind these images is a challenge. Many algorithms have been suggested till date. This paper intends to give understanding and evolution of different techniques for jpeg steganography. It summarizes various algorithms and techniques used in the past and in present. This paper also analysis's these algorithms based on the basic parameters of image steganography: Undetectability, robustness and embedding capacity.