JPEG圖像中的安全密寫方案
Secure Steganographic Algorithm in JPEG Images
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摘要: JPEG是一種常見的圖像格式，在JPEG圖像中進行密寫有著重要的實際意義。但以往的密寫技術往往會改變載體圖像的DCT系數直方圖或增大分塊效應，分析者可以據此察覺秘密信息的存在。為了提高密寫安全性，該文提出一種新的JPEG密寫方案。該方案在將秘密信息嵌入非0的非直流DCT系數時，既不改變原始圖像的DCT系數直方圖，也不增加載體圖像的分塊效應，因此可以抵抗基于直方圖和基于分塊特性的密寫分析。實驗表明，當載體圖像的質量因子大于35時，秘密信息的安全性可以得到有效保證。
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關鍵詞:
- 信息隱藏;密寫;JPEG;密寫分析
Abstract: Although it is very meaningful to embed secret messages into a cover image in JPEG format, an analyst can detect the presence of hidden data according to a change of DCT coefficient histogram or an increase of blockiness parameter. In order to improve the security of embedded information, a secure steganographic technique is proposed, in which AC DCT coefficients with non-zero values are used to carry the secret bits when the DCT coefficient histogram and blockiness property are reserved. This way, the histogram-based and blockiness-based steganalyses are effectively resisted. Simulation results show that the proposed method is secure for cover images with quality factor more than 35. -
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