CAJ | 학술논문

为抵抗YASS隐写分析算法，本文提出一种新的YASS改进算法。该算法首先利用密钥选择不规则的区域，生成一个虚拟的8×8嵌入块；然后根据图像自身特点，提出一种最小化嵌入失真的计算方法，对嵌入块修改后的量化DCT系数进行失真分析，选择失真影响最小的交流DCT系数进行秘密信息嵌入，取代传统方法直观选择前19交流DCT系数。将文中改进算法与虚拟嵌入块YASS（VH-YASS）算法进行了对比实验，实验结果证明，依据嵌入失真由小到大的顺序选择嵌入信道，在抵抗隐写分析和视觉质量方面都优于VH-YASS隐写方法。
위저항YASS은사분석산법，본문제출일충신적YASS개진산법。해산법수선이용밀약선택불규칙적구역，생성일개허의적8×8감입괴；연후근거도상자신특점，제출일충최소화감입실진적계산방법，대감입괴수개후적양화DCT계수진행실진분석，선택실진영향최소적교류DCT계수진행비밀신식감입，취대전통방법직관선택전19교류DCT계수。장문중개진산법여허의감입괴YASS（VH-YASS）산법진행료대비실험，실험결과증명，의거감입실진유소도대적순서선택감입신도，재저항은사분석화시각질량방면도우우VH-YASS은사방법。
This paper proposed a new YASS algorithm to resist steganalysis. Virtual embedding blocks are generated firstly by using a key to select random region. Then a calculation method for minimizing embedding distortion is put forward and the quantized DCT coefficients for embedding the modified block distortion is analyzed. Secret information is embedded by selecting AC DCT coefficients which have the minimum distortion effects, instead of traditional algorithm which selects the first 19 AC DCT coefficients instinctively. The proposed algorithm is compared with VH-YASS algorithm by experiments.The experimental results show that the embedded channel choice based on embedding distortion ascending order is better than VH-YASS steganography methods in terms of resistance steganalysis and visual quality.