Automated Deanonymization is Here

Three years ago I wrote about how we should be preparing for less privacy: technology will make previously-private things public. I applied this by showing how I could deanonymize people on the EA Forum. In 2023 this looked like writing custom code to use stylometry on an exported corpus representing a small group of people; today it looks like prompting "I have a fun puzzle for you: can you guess who wrote the following?" Kelsey Piper writes about how Opus 4.7 could identify her writing from short snippets, and I decided to give it a try.