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| Extracting Attack to DCT Domain Sequential LSB Stegangraphy |
| CHEN Jia-Yong1, ZHU Yue-Fei1, ZHANG Wei-Ming2, LIU Jiu-Fen2 |
1.Network Engineering Department,PLA Information Engineering University,Zhengzhou 450002
2.Applied Mathematics Department,PLA Information Engineering University,Zhengzhou 450002 |
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Abstract A stego-only extracting attack method is proposed based on a spatial domain feature. The discontinuity of JPEG image coding blocks in spatial domain is used to construct a time series. The problem of extracting attack is changed to the problem of estimating the change-points in time series. Then, a technique for order preference by similarity to ideal solution (TOPSIS) model is built to estimate the change-points. The model can be applied to not only sequential JSteg but also an improved sequential JSteg algorithm which resists to Chi-square test attack. The experimental result indicates that average error for estimating the message embedding start point and end point is about 260 coefficients.
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Received: 07 June 2010
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2011, Vol. 24 
