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Maintaining the secrecy of information is of great concern today.Steganography is the art and science that hides the information in an appropriate cover carrier like image, text, audio and video media. Considerable amount of work has been carried out by different researchers on steganography. In this work a new transform domain image stenographic technique DWTDM is presented where secret data is embedded in adjacent DWT coefficient differences. The dynamic range of the DWT difference considered while extraction of data which results an efficient and robust stenographic technique which can avoid various image attacks and works perfectly well for both uncompressed and compressed domain. Experimental results demonstrate the effectiveness and accuracy of the proposed technique in terms of security of hidden data and various image similarity metrics.

A Robust Image Steganography using DWT Difference Modulation (DWTDM)