Abstract
Encryption and Watermarking are image processing tools that are used mostly separately. Encrypting a document completely obscures it and watermarking is applied mostly for copy right protection. For entertainment type videos, partial encryption and watermarking may be integrated such that both objectives are attained. We report in this paper a novel combined partial encryption and watermarking algorithm for digital videos using chaotic system and support image. Watermarks are generated by using iris information of the authentic user or the authentic producer of the digital video. Watermarks of full size and half size are embedded in the luminance frame (s) of the video using simple LSB steganography. A sequence of color frames is watermarked in two phases, and partially encrypted in two layers, the watermarks considered are encrypted before embedding. The luminance frame (s) is (are) preprocessed before embedding with the watermarks to defy stega-analysis. Chaotic logistic map and a gray level support digital image is used for obtaining unique row/column sequences as well as for generating robust random binary sequences. A support color digital image is used in the first layer encryption of the digital video. Modified Rabinovich 4 dimensional hyper-chaotic system is used for second layer encryption. Encryption algorithm is applied in R, G, B frames separately. The technique may also be applied for integrated encryption and watermarking of digital images.
Highlights
We live in an era of internet where data information exchanges are mostly multimedia images and videos
The technique is described for application in digital video, it may be used for integrated encryption and watermarking of digital image for authentic distribution and copyright protection
To show results of our proposed integrated encryption and watermarking, we consider the multimedia video file “Foreman.avi” which is of 400 color frames, each of size 144x176 pixels and total duration 33.332 seconds
Summary
We live in an era of internet where data information exchanges are mostly multimedia images and videos. DNA technology based encryption, where hyper chaotic map is used for confusion stage and DNA sequence is used for diffusion stage, is reported in [6, 7, 8, 9]. It is reported in [10] that chaos based algorithm may be weak against chosen-cipher text and chosen-plaintext attacks because of prevalent correlations among adjacent pixels in an image. We take help of two support images, one gray and one color of same frame size as the video frames, for robust pixel position selections for watermarking and robust diffusion ciphering for encryption of color frames We call it integrated technique as we use chaos and hyper chaos as tools and that second phase of watermarking can never be approached unless encryption is undone. The technique is described for application in digital video, it may be used for integrated encryption and watermarking of digital image for authentic distribution and copyright protection
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