Information Hiding Based on CAVLC in H.264/AVC Standard

This paper proposes an information hiding scheme based on the Context-based Adaptive Variable Length Coding (CAVLC) mode of entropy encoding in H.264/AVC video encoding standard. The scheme hides information in the process of encoding the trailing coefficient in CAVLC, just in luminance (luma) components of 4×4 DCT data blocks. By modifying the check sum of codeword encoded for the trailing coefficient to match the hidden binary information 0 or 1 and one block can hide 1 bit information. The experiment results show that the scheme has a low computational complexity and doesn't make any influence on bit rate of compressed bit stream.