Joint Encryption and Watermarking Technique Using Block Cipher and Wavelet

This paper proposes a joint encryption and watermarking technique based on random block permutation and DWT with the motivation to enhance the security of the multimedia content. The original image is sectioned into the blocks and shuffle the blocks using random permutation, In this technique copyright information is concealed into an encrypted image. Based on the results, permutation of blocks is effective in significantly reducing the correlation thereby reducing the level of perceptual information, whereas the permutation of blocks is good at producing higher level security. Watermarked crypto image is freely distributed to channel with enhanced security, because it combines both encryption as well as watermarking techniques.