Design and Analysis of Efficient and Robust DWT based Image Steganography Technique

The image steganography is known as a technique of hiding information in cover object such that the analysis of stego image doesn’t provides any clue of hidden data. The image steganography is not a new concept but the recent growth in the computer networks makes it live again because of large visual data sharing in computer networks and greater embedding capability than text and with a large number of compression formats which makes image suitable carrier for hidden data. In this paper we are designing and analyzing the Discrete Wavelet Transform (DWT) based technique. The DWT has its own advantage because of its matching with human visual perception which helps in deciding the embedding components that cannot be easily detected by a steganographic analysis or human vision. The paper analyzes this technique for different attacks, different block sizes and for different cover image to hidden image sizes. Keywords-Steganography, Data hiding, Discrete Wavelet Transform (DWT), Security, Steganalysis.