Author: Sagar Rajkumar Somani , P.S. Malge
Abstract: Digital video and secret data sometimes needs to be stored and processed in an encrypted format to maintain security and privacy. Data hiding approach is necessary to perform in these encrypted videos for the purpose of content notation and tampering detection. In this way, data hiding in encrypted domain without decryption preserves the confidentiality of the content. In addition, it is more efficient without decryption followed by data hiding and re-encryption. Here, data hiding directly in the encrypted version of H.264/AVC video stream is approached, which includes the following three parts, i.e., H.264/AVC video encryption, data embedding, and data extraction. By analyzing the property of H.264/AVC 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 replacement technique, without knowing the original video content. Chaos crypto system is used here to encrypt/decrypt secret text data before/after data embedding/extraction. In order to adapt different application scenarios, data extraction is done either in the encrypted domain or in the decrypted domain.
Keywords: Encryption, chaos, bit substitution, secret, decryption
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