Latest · Applied crypto
The server can't read this: designing zero-knowledge sharing
How GhostShare shares notes and files in real time while making the server mathematically unable to read them — in-browser key derivation, AES-GCM, and direct-to-R2 encrypted uploads.
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Systems
A B-Tree on disk: writing a storage engine from scratch
What actually happens between INSERT and the disk — building bad-db's on-disk format, a hand-rolled B-Tree index, tombstones, and compaction in plain Java.
Security
Where LLM guardrails break: notes from running a jailbreak contest
I built a prompt-injection contest and handed a few hundred people a scoreboard and a reason to break it. Here's what actually cracks an LLM's guardrails — and what it means for defending them.