Secret information sharing algorithm based on CL multi-wavelet and combination bit plane for confidential communication

Abstract

In view of the contradiction between capability, invisibility and robustness of the existing information hiding algorithms, a preprocessing algorithm for digital image based on CL( Chui-Lian) multi-wavelet transform and Combination Bit Plane( CBP) was proposed. Then the digital image preprocessed by CL multi-wavelet and CBP was taken as the cover image to embed secret information for confidential communication and image sharing. CL multi-wavelet transform could divide the cover image into four lowest resolution sub-images with different energy level. And CBP method could analyze the above four subimages into different bit planes as the final embedding regions. During the hiding procedure, robust information, secret information and fragile information could be embedded according to the energy and robustness characteristics of the embedding regions. The experimental results show that the robustness against several common attacks described in this paper has certain enhancement compared with other two methods when the embedding rate is 25%. The Peak Signal-to-Noise Ratio( PSNR) is increased by 37. 16% and 20. 00% respectively compared with Discrete Cosine Transform-Least Significant Bit( DCT-LSB)and Discrete Wavelet Transform-Least Significant Bit( DWT-LSB) algorithm.