Tampering Detection for Encrypted Compressed Video Watermarking Using Bit Substitution for Copy Right Protection

The project presents that data hiding and logo watermarking in encrypted compressed video bit streams, for privacy informat ion like binary watermark to protect videos during transmission or cloud storage. Digital video sometimes needs to be stored and proc essed in an encrypted format to maintain security and privacy. Data hiding and embedding watermark approaches are necessary to perform in these encrypted videos for the purpose of content notation and tampering detection. Here, Data hid ing and embedding watermark directly in the encrypted version of H.264/CAVLC v ideo stream is approached, which includes the following three parts, i.e., H.264/CAVLC v ideo encryption, watermark embedding, data embedding, watermark ext raction and data extract ion. By analyzing the property of H.264 codec, the code words of intra prediction modes, the code words of motion vector differences, and the code words of residual coefficients are encrypted with stream ciphers. Then, a data hider may embed additional data in the encrypted domain by using bits wrapping technique, without knowing the original v ideo content. Arnold transform is used here to scramble/descramble the secret watermark before/after data embedding/ext raction. In order to adapt to different application scenarios, dat a extraction can be done either in the encrypted domain or in the decrypted domain. The simulated results shows that used methods provides better performance in terms of computation efficiency ,high data security and video quality after decryption. The parameters such as Mean square error, PSNR, correlation and SSIM are evaluated to measure its efficiency.