DTCWT based high capacity steganography using coefficient replacement and adaptive scaling

The steganography is used for secure communication. In this paper we propose Dual Tree Complex Wavelet Transform (DTCWT) based high capacity steganography using coefficient replacement and adaptive scaling. The DTCWT is applied on cover image and Lifting Wavelet Transform2 (LWT2) is applied on payload to convert spatial domain into transform domain. The new concept of replacing HH sub band coefficients of DTCWT of cover image by LL sub band coefficients of payload is introduced to generate intermediate stego object. The adaptive scaling factor is used based on entropy of cover image to scale down intermediate stego object coefficient values to generate final stego object. It is observed that the capacity and security are increased in the proposed algorithm compared to existing algorithms.

[1]  R. Roshan,et al.  Image steganography using discrete fractional Fourier transform , 2013, 2013 International Conference on Intelligent Systems and Signal Processing (ISSP).

[2]  Amir-Masoud Eftekhari-Moghadam,et al.  Digital Image Steganography Based on Integer Wavelet Transform and Assignment Algorithm , 2012, 2012 Sixth Asia Modelling Symposium.

[3]  Richard Baraniuk,et al.  The Dual-tree Complex Wavelet Transform , 2007 .

[4]  T. Narasimmalou,et al.  Optimized discrete wavelet transform based steganography , 2012, 2012 IEEE International Conference on Advanced Communication Control and Computing Technologies (ICACCCT).

[5]  Sos S. Agaian,et al.  Shannon Entropy based Randomness Measurement and Test for Image Encryption , 2011, Inf. Sci..

[6]  D. Pal,et al.  Authentication technique for gray images using DCT (ATGIDCT) , 2012, 2012 Third International Conference on Emerging Applications of Information Technology.

[7]  Hoda Motamedi,et al.  A new image steganography based on denoising methods in wavelet domain , 2012, 2012 9th International ISC Conference on Information Security and Cryptology.

[8]  K. Kanimozhi,et al.  Dual transform based steganography using wavelet families and statistical methods , 2013, 2013 International Conference on Pattern Recognition, Informatics and Mobile Engineering.

[9]  Sudhir Keshari,et al.  Weighted fractional Fourier Transform based image Steganography , 2011, 2011 International Conference on Recent Trends in Information Systems.

[10]  Syed Monowar Hossain,et al.  A block based data hiding method in images using pixel value differencing and LSB substitution method , 2012, 2012 15th International Conference on Computer and Information Technology (ICCIT).