Simon Willison’s Weblog

Schneier on Security: Cryptanalysis of SHA-1. If you want to understand the “breaking” of SHA-1, this is the place to go. Surprisingly accessible.

Posted 19th February 2005 at 3:12 pm

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

bruce-schneier 32 cryptanalysis 1 hashing 12 security 569 sha 2

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