Workshop materials

Slides (SpeakerDeck)

Video (Youtube)

Start files

• precomputed prefixes
• PNG pictures: yes.png / no.png
• GIF animation: yesno.gif

References

• simple PNG chunk reader/writer: minipng.py

  • resulting 'merged' image: final.png

• simplified Kaitai grammar for abusive PNG files (starting with a dummy chunk): png_simple.ksy

• tiny PNG colliding files: Ken Silverman' most interesting / 3x1 R,G,B => tiny1.png / tiny2.png

Captures

• collisions: FastColl / UniColl / HashClashCPC (log)

• precomputed collisions: generic PNG / specific header PNG

• collisions: GIF w/ FastColl / PNG w/ UniColl

External links

• Kaitai IDE
• HashClash