The paper proposes data hiding with codeword substitution in encrypted H.264/AVC video streams. Here video is encrypted and data is hided in the video to maintain the security and privacy. In this way data hiding in encrypted domain without decryption preserves confidentiality of the content. By analyzing the property of H.264/AVC codec, the codeword of the intra-prediction modes, the code words of motion vector differences and code words of residual coefficients are encrypted with the stream ciphers. The data hider may embed additional data in the encrypted domain by using code word substitution technique, without knowing original content. Data extraction can be done in encrypted domain or in the decrypted domain.
Index Terms—Data hiding, encrypted domain, H.264/AVC, codeword substituting.
I. INTRODUCTION
H
.264/AVC [1] video coding standard has been developed and standardized collaboratively by both the ITUT VCEG and ISO/IEC MPEG organization. H.264/AVC is a video compression format [2] i.e. standard for high definition digital video. H.264/AVC video streams generally avoids leakage of video content which can help to address the security and privacy concerns with cloud computing. Similarly when medical videos or surveillance videos are encrypted for protecting the privacy of the people, a database manager can embed the personal information into the corresponding encrypted videos to provide the data management capabilities in the encrypted domain. With the