1. What images contain hidden messages? 15pts Tools Used: Simple Steganalysis Suite Awarded Points:
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1 Forensic Challenge 13 A Message in a Picture Name: Faure Bastien Country: France beobast@gmail.com Profession: Student - Master s degree 4 th year 1. What images contain hidden messages? 15pts Tools Used: Simple Steganalysis Suite The first stego image I discovered was IMG_0496.png from pack 2. The first row of pixels obviously contains a hidden message because pixel colours are completely unrelated from the others rows. Page 1 of 6
2 Then I started to perform LSB Enhancement technique. I found hidden messages in IMG_0406.png from pack 1. This is verified by a neighbourhood histogram : The average number of neighbours for each pixel is between 4 and 5 for a normal image. Here the average value is 6.5. Page 2 of 6
3 A typical histogram looks like this : This is also verified by a pixel value attack : This attack is an idea I had and need to be improved. It looks like edge detection techniques. Page 3 of 6
4 I also found a hidden message in IMG_0744.png from pack 3. This is verified by a Chi-Square test : Page 4 of 6
5 I found a hidden message in IMG_0601.png from pack 2. The neighbourhood histogram average value is The message could be hidden in the bottom of the image (chi-square test). Summary of images containing hidden messages : Images Pack Certainty IMG_0496.png 2 100% IMG_0406.png 1 100% IMG_0744.png 3 100% IMG_0601.png 2 100% IMG_0454.png 2 75% IMG_0412.png 1 40% IMG_0560.png 2 50% IMG_0713.png 3 40% 2. Describe how each hidden message is stored in the images. Be very specific. 15pts Tools Used: Simple Steganalysis Suite Images I m pretty sure they contain hidden messages : IMG_0496.png: o Message hidden in the first row of pixels, except the first one (top left). All the bits are potentially used. IMG_0406.png, IMG_0744.png and IMG_0601.png: o messages embedded in the LSB Images I m less sure : IMG_0412.png: o I suspect this image to contain hidden message because the difference histogram attack value is unusual. I m 40% sure. IMG_0454.png : o I suspect this image to contain hidden message because both the difference histogram attack value and the Primary Sets attack value are high. I m 75% sure. IMG_0560.png: o I suspect this image to contain hidden message because the difference histogram attack value is unusual and the Chi-Square tests from right to left and from bottom to top seem to indicate a small hidden message. I m 50% sure. IMG_0713.png: o I suspect this image to contain hidden message because of the result of a top to bottom Chi-Square test. I think a message could be hidden in the sky. I m 40% sure. Page 5 of 6
6 3. What are the hidden messages contained in those images (save each hidden message in a file and submit as a.zip archive along with this document)? List what message was extracted from what image below. Tools Used: 15pts Bonus 1: With the tools you have developed, what hidden messages are you able to identify in the wild (bittorrent, usenet, web)? Tools Used: 5pts Bonus 2: Provide a link to your tool (src, binary and documentation) Tools Used: 10pts I started to develop a Java program and implemented simple steganalysis techniques. The program is called Simple Steganalysis Suite. You can find more information here : Documentation : Sources : Executable JAR : Conclusion: That was a really interesting challenge. I didn t have enough time to implement everything I wanted. I mainly focused on LSB embedding. Further developments: implement RS steganalysis technique palette image steganalysis techniques machine learning techniques Page 6 of 6
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