Steganography Using Sudoku Revisited

人力資源報告Image and Signal Processing

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Steganography Using Sudoku Revisited

Wien Hong, Tung-Shou Chen, Chih-Wei Shiu

Department of Information Management,Yu Da College of Business, Miaoli, 361,Taiwan

Graduate School of Computer Science and Information Technology, National Taichung Institute of Technology, Taichung, 404, Taiwan

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Speaker Chih-Wei Shiu

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IITA 2008, Shanghai, China

人力資源報告Image and Signal Processing

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Outline

• Introduction

• Related works

• The proposed scheme

• Experimental results

• Conclusions

人力資源報告Image and Signal Processing

Introduction

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Cover Image

Secret Data Stego-image

Extraction Algorithm

Embedding Algorithm

Extraction Secret Data

人力資源報告Image and Signal Processing

Related works

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Each of the rows, columns and blocks are filled by the number 0-8

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Reference matrix M

人力資源報告Image and Signal Processing

Related works

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Original image

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Secret digits

Stego image

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CEV=M(8,5)

CEV

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ECHCEH=M(12,8)

ECBCEB=M(13,3)

|12-8|+|5-5|=4

|12-12|+|5-8|=3

|12-13|+|5-3|=3

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Reference matrix M

人力資源報告Image and Signal Processing

Related works

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Original image

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Secret digits

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Stego image

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CEV=M(7,12)

CEV

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CEHCEH=M(10,16) CEB

CEB=M(11,13)

|10-7|+|12-12|=3

|10-10|+|12-16|=4

|10-11|+|12-13|=2

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Reference matrix M

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人力資源報告Image and Signal Processing

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The proposed scheme

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Original image

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Secret digits

CEV=M(8,5)

CEV

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CEHCEH=M(12,8)

CEBCEB=M(13,3)

|12-8|+|5-5|=4

|12-12|+|5-8|=3

|12-13|+|5-3|=3

Reference matrix M

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ECA=M(11,6) |12-11|+|5-6|=2

CEA

人力資源報告Image and Signal Processing

Experimental Results

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Comparison of stego image quality

人力資源報告Image and Signal Processing

Conclusions

• The proposed method introduces an additional set of candidate elements CEA for referencing.

• image quality outperform Chang’s method at the same embedding capacity.

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人力資源報告Image and Signal Processing

Thanks for your listening

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