A NOVEL, PRIVACY PRESERVING SECRET INFORMATION EMBEDDING TECHNIQUE INTO ENCRYPTED VIDEO STREAM

Abstract

Transmission of video over internet is prone to attacks from untrustworthy system administrators. Hence it is necessary to perform encryption of video content for maintaining privacy and security. For authentication and damage detection, it is necessary to embed secret information in these encrypted videos. A novel method is proposed where the secret information is embedded directly into encrypted video stream, thereby maintaining confidentiality of video content. The input video is   compressed using H.264/AVC encoder, and selectively encrypted. The codewords of residual coefficients, motion vector differences and intra-prediction modes are encrypted using a stream cipher. The data hider then embeds secret information in this encrypted video using a novel codeword substitution technique, and is unaware of the content of video. Thus confidentiality of video content is protected. The authenticated receiver can then extract the hidden data either in encrypted or decrypted domain. We compute PSNR, SSIM and VQM to validate the feasibility and efficiency of the proposed work.