1. Steganography Nathan Shirley

2. Any attempt to hide information

3. Ancient Steganography
Greece – head tattoos
France – Tattoos on Messenger's backs
Mixing Fonts – printing presses
Micro Dots – Small ink dots
Jeremiah Denton – POW Morse Code with his eyes on international tv

4. Digital Steganography
Most Common - Images, Video, and Sound files (lowest bit)
Printers – Use small yellow dots to encode serial number and timestamp
Delays in network packets

5. Lowest Bit Steganography
Pixels represented by 32 bits
8 for each: Red Green Blue Alpha
32 Bit Format: 0xAARRGGBB
If we flip the lowest bit (or two) it will only change the value by 1/256th

6. Lowest Bit Steganography
Bits available to store information:
Lowest Bit
Lowest 2 Bits

7. Viewing only the 2 least significant bits
Basic Example
Viewing only the 2 least significant bits
Original Image

8. Stegosaurus (Steganography Tool)

9. The Secret Data
14 KB of Christmas ASCII Art

10. Before and After Adding Data
SteganographySimple.java

11. LSB Before and After
LSBViewer.java

12. Diff between images
ImageDiff.java

13. New Method
Randomize Position of Points using SHA1 based PRNG to generate random x and y coords
Store Hash Map of all previously “used” bits to prevent collisions
In the case of a collision, skip that point and generate the next

14. Basically Connect the Dots

15. New Method Before and After
SteganographyAdvanced.java

16. New Method LSB
LSBViewer.java

17. New Method Diff
ImageDiff.java

18. The New Secret Data
140 KB of NMAP man pages

19. Disadvantages: Adding too much Data
140 KB – NMAP man page
Original Simple Sequential Connect The Dots

20. GitHub

21. Demo