Thursday, 9 July 2015

DWT Technique for Steganography

DWT Technique for Steganography
Dontabhaktuni Jayakumar1, S. Boopalan2

1Assistant Professor, Department of Electronics and Communication Engineering, Holy Mary Institute of Technology and
Science, Bogaram (V), Keesara (M), Rangareddy (D), Telangana, India
2Teaching Fellow, University College of Engineering, Villupuram, Tamilnadu.India

Abstract Steganography is the hiding of a secret message within an ordinary message and the extraction of it at its destination. Steganography takes cryptography a step farther by hiding an encrypted message so that no one suspects it exists. Ideally, anyone scanning your data will fail to know it contains encrypted data. Additionally secret data embedding is performed using frequency domain approach - DWT (Discrete Wavelet Transform), DWT outperforms than DCT (Discrete Cosine Transform). Secret data is hidden in one of the high frequency sub-band of DWT by tracing skin pixels in that sub-band. Different steps of data hiding are applied by cropping an image interactively. Cropping results into an enhanced security than hiding data without cropping i.e. in  whole image, so cropped region works as a key at decoding side. This study shows that by adopting an object oriented Steganography mechanism, in the sense that, we track skin tone objects in image, we get a higher security. And also satisfactory PSNR (Peak- Signal-to-Noise Ratio) is obtained.

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