CAJ | 학술논문

在对JPEG图像压缩域数据进行分析的基础上,提出了一种以JPEG图像为载体的隐写算法.算法利用纠错码信息隐藏的原理,以对共享密钥进行纠错编码得到的纠错码码字为载体码字,将对秘密信息进行映射编码得到的错误图样嵌入其中,得到载密码字;然后以块为单位,将载密纠错码码字嵌入到JPEG图像压缩域中幅值较大的AC系数中.实验及分析表明,算法在确保一定的嵌入容量的情况下,具有较好的视觉不可感知性和统计不可感知性,并且满足密码学中的"Kerchhoff准则".
재대JPEG도상압축역수거진행분석적기출상,제출료일충이JPEG도상위재체적은사산법.산법이용규착마신식은장적원리,이대공향밀약진행규착편마득도적규착마마자위재체마자,장대비밀신식진행영사편마득도적착오도양감입기중,득도재밀마자;연후이괴위단위,장재밀규착마마자감입도JPEG도상압축역중폭치교대적AC계수중.실험급분석표명,산법재학보일정적감입용량적정황하,구유교호적시각불가감지성화통계불가감지성,병차만족밀마학중적"Kerchhoff준칙".
According to the analysis of compressed data of JPEG encoded images,a secure steganographic algorithm for JPEG images is proposed.With this algorithm,a mapping relationship between secret bits and error map is built first and then the error map is embedded into the cover-codeword which is derived from error-correcting encoding to the shared key,and the stego-codeword can be obtained.Afterwards,on a block-by-block basis,the stego-codeword is embedded into the larger AC coefficients in the compressed domain.Experimental results show that the proposed algorithm has a good visual and statistical imperceptibility and can guarantee a considerable embedding capacity as well.Furthermore,the algorithm satisfies the "Kerchhoff" rule in cryptography.