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

Claude Opus 4.8: "a modest but tangible improvement" - 28th May 2026
I think Anthropic and OpenAI have found product-market fit - 27th May 2026
Notes on Pope Leo XIV's encyclical on AI - 25th May 2026

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

collisions 2 hashing 12 md5 4 postscript 1 security 606

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