Steganography is the art of concealing secret information in some given information. Steganography hides the existence of the message unlike cryptography which keeps the contents of message secret. Image steganography is the branch of steganography where secret information is hidden inside an image. There are various techniques of image steganography i.e., spatial domain and frequency domain. In this paper, a review of image steganography techniques is presented using qualitative parameters like robustness, embedding capacity and quantitative parameters like PSNR, SNR, MSE are taken into consideration for analyzing the efficiency of various techniques of image steganography. The study reveals that transform domain techniques are more robust than spatial domain techniques even though are more complex than spatial domain techniques. Furthermore, it is observed that edge based data hiding in DCT domain has more embedding capacity and is more robust than spatial domain techniques.

Imagesteganography,DCTdomain,datahiding

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