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Image Forensics and Steganalysis (Hans) Georg Schaathun Department of Computing University of Surrey 26 June 2009 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 1 / 47 Outline Examples 1 Tampering Different

  1. Image Forensics and Steganalysis (Hans) Georg Schaathun Department of Computing University of Surrey 26 June 2009 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 1 / 47

  2. Outline Examples 1 Tampering Different Security Scenarioes Steganography and Steganalysis 2 Steganography JPEG and F5 The Markov Based Model Double Compression Conditional Probability Features Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 2 / 47

  3. Examples Outline Examples 1 Tampering Different Security Scenarioes Steganography and Steganalysis 2 Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 3 / 47

  4. Examples Tampering Outline Examples 1 Tampering Different Security Scenarioes Steganography and Steganalysis 2 Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 4 / 47

  5. Examples Tampering How worrying is the Iranian weaponry? Picture from AFP . One of the rockets really fired Some rockets are the product of PhotoShop... The image was retracted after publication (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 5 / 47

  6. Examples Tampering How worrying is the Iranian weaponry? Picture from AFP . One of the rockets really fired Some rockets are the product of PhotoShop... The image was retracted after publication (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 5 / 47

  7. Examples Tampering How worrying is the Iranian weaponry? Picture from AFP . One of the rockets really fired Some rockets are the product of PhotoShop... The image was retracted after publication (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 5 / 47

  8. Examples Tampering How worrying is the Iranian weaponry? Picture from AFP . One of the rockets really fired Some rockets are the product of PhotoShop... The image was retracted after publication (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 5 / 47

  9. Examples Tampering Crime Scene Photography What did the crime scene look like? Photography is vital evidence Photography can be altered... What can we prove? (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 6 / 47

  10. Examples Tampering Crime Scene Photography What did the crime scene look like? Photography is vital evidence Photography can be altered... What can we prove? (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 6 / 47

  11. Examples Tampering Who were actually there? Former Culture Secretary James Purnell Late for the meeting. Arrived after three other MPs had to leave. James Purnell was added to the picture (BBC News - 28 September 2007) (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 7 / 47

  12. Examples Different Security Scenarioes Outline Examples 1 Tampering Different Security Scenarioes Steganography and Steganalysis 2 Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 8 / 47

  13. Examples Different Security Scenarioes Is the photo real? Does it show reality? Or has its author exercises artistic licence? tampering with evidence adding grandeur to a story computer generated images For example Merging images Erasing details or objects (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 9 / 47

  14. Examples Different Security Scenarioes Where does the photo come from? Objective: add credibility to claims All information about the image is potentially useful... Which camera took the image? Time of day, time of year, etc. Subsequent image processing contrast, compression, brightness, etc. (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 10 / 47

  15. Examples Different Security Scenarioes Where does the photo come from? Objective: add credibility to claims All information about the image is potentially useful... Which camera took the image? Time of day, time of year, etc. Subsequent image processing contrast, compression, brightness, etc. (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 10 / 47

  16. Examples Different Security Scenarioes Is there more than meets the eye? Additional information hidden in the image? known as steganography (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 11 / 47

  17. Examples Different Security Scenarioes Three important questions Is the photo real? 1 Where does the photo come from? 2 Is there more than meets the eye? 3 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 12 / 47

  18. Examples Different Security Scenarioes User scenarios News agency, news paper, etc. can we trust images from the public? they can get thousands of images in a day Forensics and Court of Law what can we prove? what is the truth? is the image real or synthetic? Intelligence services is there secret communications hidden in the image? (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 13 / 47

  19. Steganography and Steganalysis Outline Examples 1 Steganography and Steganalysis 2 Steganography JPEG and F5 The Markov Based Model Double Compression Conditional Probability Features Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 14 / 47

  20. Steganography and Steganalysis Steganography Outline Examples 1 Steganography and Steganalysis 2 Steganography JPEG and F5 The Markov Based Model Double Compression Conditional Probability Features Our group 3 Conclusion 4 (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 15 / 47

  21. Steganography and Steganalysis Steganography The basic problem Simmons Crypto’83 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bob . . . . . . . . . . . . . . . . . . . . . . . . Alice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Hans) Georg Schaathun Image Forensics and Steganalysis 26 June 2009 16 / 47

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