CAJ | 학술논문

视频数字隐写具有隐藏容量大的优点,但是通常在获得隐藏容量的间时,却忽视了安全性.为了在二者之间取得平衡,利用纠错码信息隐藏的原理,提出了一种以压缩视频为载体的数字隐写算法.该算法在进行秘密信息嵌入时,采用了二次嵌入的策略,即首先将秘密信息嵌入到纠错码码字,然后将得到的载密纠错码码字嵌入到与不采用差分编码的系数相对应的行程幅度对的幅度值,同时采用比特率控制策略来减小信息嵌入前后的视频流长度变化.实验及分析表明,该算法的隐写结果不仅具有较好的视觉和统计上的不可感知性,而且满足密码学中的"Kerchhoff准则".此外,该算法在确保一定的嵌入容量的情况下,能够使视频流长度在信息嵌入前后保持近似不变.
시빈수자은사구유은장용량대적우점,단시통상재획득은장용량적간시,각홀시료안전성.위료재이자지간취득평형,이용규착마신식은장적원리,제출료일충이압축시빈위재체적수자은사산법.해산법재진행비밀신식감입시,채용료이차감입적책략,즉수선장비밀신식감입도규착마마자,연후장득도적재밀규착마마자감입도여불채용차분편마적계수상대응적행정폭도대적폭도치,동시채용비특솔공제책략래감소신식감입전후적시빈류장도변화.실험급분석표명,해산법적은사결과불부구유교호적시각화통계상적불가감지성,이차만족밀마학중적"Kerchhoff준칙".차외,해산법재학보일정적감입용량적정황하,능구사시빈류장도재신식감입전후보지근사불변.
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.