[
](../preview.png)
# Workshop materials
[Slides](https://speakerdeck.com/ange/colltris) (SpeakerDeck)
[
](https://speakerdeck.com/ange/colltris)
[Video](https://www.youtube.com/watch?v=BcwrMnGVyBI) (Youtube)
[
](https://www.youtube.com/watch?v=BcwrMnGVyBI)
## Start files
- precomputed [prefixes](prefixes/README.md)
- PNG pictures: 
[yes.png](yes.png) / 
[no.png](no.png)
- GIF animation: 
[yesno.gif](yesno.gif)
## References
- simple PNG chunk reader/writer: [minipng.py](minipng.py)
- resulting 'merged' image: 
[final.png](final.png)
- simplified Kaitai grammar for abusive PNG files (starting with a dummy chunk): [png_simple.ksy](png_simple.ksy)
- tiny PNG colliding files: 
Ken Silverman' [most interesting](http://web.archive.org/web/20070905115613/http://www.jonof.id.au/forum/index.php?topic=934.15#msg5809) / 
3x1 R,G,B => [tiny1.png](tiny1.png) / [tiny2.png](tiny2.png)
## Captures
- collisions: [FastColl](../examples/fastcoll.svg) / [UniColl](../examples/unicoll.svg) / [HashClashCPC (log)](../examples/cpc.html)
- precomputed collisions: [generic PNG](../examples/pngGen.svg) / [specific header PNG](../examples/pngSpec.svg)
- collisions: [GIF w/ FastColl](../examples/gifFastColl.svg) / [PNG w/ UniColl](../examples/pngUniColl.svg)
## External links
- [Kaitai IDE](http://ide.kaitai.io)
- [HashClash](https://github.com/cr-marcstevens/hashclash)