Dual Domain Image Encryption using Bit Plane Scrambling and Sub –Band Scrambling

Abstract

Today's world is brimming with abundant intelligence in data transmission of secret images all over the public network which leads to many threats that comprise data manipulation hacking certain content, eradicating the data, etc. To overcome these problems, the proposed encryption algorithm is introduced. In this paper, a block-wise image encryption technique is performed in which bit plane slicing is utilised for the spatial domain, and integer wavelet transformation (IWT) is utilised for the frequency domain. Where, each domain is scrambled by the chaotic arrangement produced by the 8 different chaotic maps for all the 8 planes of the image. Now the XOR operation is performed to generate the key utilising the respective chaotic maps, and we get the spatial domain scrambled image (SDSI). Then SDSI image is segmented into four fixed blocks, and each block is transformed in frequency domain utilising the integer wavelet transformation (IWT), and again chaotic maps are implemented to execute the frequency domain scrambling. At the final stage by performing the inverse IWT (IIWT), the final encrypted image is secured. To confirm the robustness of algorithm, various statistical analysis has been performed, and the obtained results are analysed with ancient existing methodologies. According to the validated results and analysis, the encrypted image is tenacious, stable and retainable to the numerous cyber-attacks and hackers.