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Sometimes there is need to store a digital encrypted video for a security purpose. For the video encryption purpose we need to hide a data behind the video. There are many techniques to hide a data. In this paper, a scheme is proposed in which the data hiding is done in encrypted version directly which includes the following different parts i.e. H.264/AVC video encryption, after that data embedding and at last data extraction. The codeword substitution method is used for getting the better results we used the codewords of motion vector differences and the code words of the residual coefficients. After that we can again hide the additional data by the method of codeword substitution. At the receiver side we can extract the data from the encrypted version directly or else we can extract the data and the original video by using encryption key. The experimental results shows the system’s efficiency and feasibility.

Data Hiding in Encrypted H.264/AVC Video Streams by Codeword Substitution