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Example : Steganalysis

To illustrate the capabilities of hypothesis testing steganalysis, shown below are images with and without hidden data.

Pepper image without hidden data

 

Pepper image with hidden data (hiding rate R =100)

 

Pepper image with hidden data (hiding rate R =15)

Even with careful scrutiny it is essentially impossible to see the effects of the hidden data on the image. However, though we do not see the 32KB of data hidden in the second image, we can detect the presence of hidden data in 99.99% of images with less than .024% false alarms. For messages about 2% of the size of the cover image (as in the third image, which has 4.8KB of message data), we correctly detect the presence of hidden data 80% of the time with 20% false alarms. We have also obtained comparable results using the machine learning approach.

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