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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