Authentication/Secret Message Transformation through Wavelet Transform Based Subband Image Coding (WTSIC)

In this paper a DWT based frequency domain steganographic technique, termed as WTSIC has been proposed where the cover PPM image transform into the time domain through DWT, resulting four sub-image components as `Low resolution´, `Horizontal orientation´, `Vertical orientation´ and `Diagonal orientation´. Secret message/image bits stream in varying positions are embedded in all three components and the experimental results against statistical and visual attack has been computed and compared with the existing steganographic algorithm like IAFDDFTT, in terms of Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR), Standard Deviation (SD) Analysis and Image fidelity (IF) Analysis, which shows better performances in WTSIC.