Secure Steganographic Algorithm for MPEG Compressed Video
安全的MPEG压缩视频数字隐写算法

Video steganography has the advantage of large embedding capacity,but the security is usually neglected when obtain the capacity.In order to balance the two aspects,a secure steganographic algorithm for embedding secret information in compressed video is proposed utilizing the principle of steganography based on error-correcting code.The strategy of two-time embedding is designed to embed secret bits.In other words,the secret bits are firstly embedded into the error-correcting codeword.Then by modifying the level value of run-level pair corresponding to the DCT coefficient which is not differentially encoded,the stego error-correcting codeword obtained by first-time embedding is secondly embedded.At the same time,measures are taken for the purpose of preserving video stream size.Experimental results show that the algorithm has a good visual and statistical imperceptibility,and satisfies the Kerchhoff rule in cryptography.Furthermore,the algorithm has a considerable embedding capacity,and can keep the nearly invariant size of video stream.