You can finally let an AI remember all your private files without the company that built it ever getting a peek at what it's searching.
April 6, 2026
Original Paper
Opal: Private Memory for Personal AI
arXiv · 2604.02522
The Takeaway
It solves the 'privacy vs. performance' tradeoff for personal assistants, making secure AI memory nearly 30 times faster than previous methods. This paves the way for truly private digital life-logs that are actually usable.
From the abstract
Personal AI systems increasingly retain long-term memory of user activity, including documents, emails, messages, meetings, and ambient recordings. Trusted hardware can keep this data private, but struggles to scale with a growing datastore. This pushes the data to external storage, which exposes retrieval access patterns that leak private information to the application provider. Oblivious RAM (ORAM) is a cryptographic primitive that can hide these patterns, but it requires a fixed access budget