1. http://isrc.ulster.ac.uk Steganography for Secure Digital Watermarking 1 Pratheepan Yogarajah, Dr. Joan Condell, Dr. Kevin Curran, Prof. Paul Mc Kevitt University of Ulster, UK Dr. Abbas Cheddad Umea University, Sweden

2. http://isrc.ulster.ac.uk 2 Steganography Key Encoder Cover Image Secret Data Stego Object Decoder Secret Data Communications Channel

3. http://isrc.ulster.ac.uk Secure Digital Watermarking Cover Image Secret Data Protected Image

4. http://isrc.ulster.ac.uk Digital content authentication 4 Sorry - this is NOT original. Test image Original image Original Image Attacked Image

5. http://isrc.ulster.ac.uk 5 Secret Data Cover Image Stego Object Self-Embedding

6. http://isrc.ulster.ac.uk 6 How to detect alterations (1/2) Final Result Grayscale image of Altered image Altered image Extracted grayscale image

7. http://isrc.ulster.ac.uk 7 Original image Extracted image How to detect alterations (2/2)

8. http://isrc.ulster.ac.uk Self-Embedding - Temporal information UU SDW:American Beauty-045/789+0 8 Key Frames

9. http://isrc.ulster.ac.uk 9 Temporal content change detection Original Video Attacked Video Detected Video

10. http://isrc.ulster.ac.uk Conclusion  A steganography based self-embedding technique provides a solution for digital content authentication.  Benefits - Protects commercial value of digital content - Protects the secrecy of digital content - Protects digital content from modification  Applicable fields: film/animation, TV, games, music, images 10

11. http://isrc.ulster.ac.uk 11 Thank You

12. http://isrc.ulster.ac.uk 12 Secret Data Cover Image Stego Object Self-Embedding

13. http://isrc.ulster.ac.uk 13 How to detect alterations (1/3) Altered Document Recovered Document Grayscale image of Altered Document Final Result Altered Document Recovered Document Grayscale image of Altered Document Altered Document Recovered Document