Simon Willison’s Weblog

4th April 2008 - Link Blog

Hash Collisions (The Poisoned Message Attack). Demonstrates the MD5 weakness by providing two deliberately engineered PostScript documents with the same MD5 hash but radically different rendered output.

Posted 4th April 2008 at 7:24 pm

Recent articles

sqlite-utils 4.0rc2, mostly written by Claude Fable (for about $149.25) - 5th July 2026
Have your agent record video demos of its work with shot-scraper video - 30th June 2026
Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code - 22nd June 2026

This is a link post by Simon Willison, posted on 4th April 2008.

collisions 2 hashing 12 md5 4 postscript 1 security 612

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe