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Large Language ModelsZenn AI/MLPublished: Oct 30, 2026, 19:01 JST

Local AI memory locked in encrypted vault, 9 tests run

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Local AI memory locked in encrypted vault, 9 tests run

3 Key Points

  1. What happened

    The developer built a password-protected encrypted disk-image vault for the local AI's memory and conversations. The password is never stored and must be entered each time. Nine failure tests followed — including a wrong password, a forced ejection mid-use, and a sudden network cut, which closed the vault within 10 seconds with no one left behind.

  2. Why it matters

    The tests suggest the vault reliably closes and the intake area is empty and off-limits after each run, with the work log showing only an in-use mark. That pattern points to a design where the AI's memory is unreadable whenever the vault is closed.

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Context & Analysis

The project's starting point was a private LLM running inside an isolated macOS user account, hardened so it could not be modified. The intake role had been comparing the room's contents against a reference model on each visit; this installment turns that role into a vault keeper with a fixed checklist. Two concrete gaps surfaced along the way. The Mac's search feature showed an unhelpful "unknown" status, so the developer skipped the display and checked the index settings and index location directly. Each time the vault was closed, the intake and the vault files returned to the automatic backup target, and the settings were pinned so the room's inhabitants cannot undo them. A further snag showed that a watchdog test never really stopped the AI: the AI program exited on its own when the connection dropped, so the watchdog arrived to find nothing to kill. The developer rebuilt the decoy in Python, then found that the keeper and watchdog's permissions block markers on Apple-made programs, a platform behavior the post flags as a remaining item. Next time, the plan is to build another enclosure inside the room so that even tools the AI launches can be watched together.

FAQ
How is the vault password handled?
It is never saved anywhere and must be entered each time the owner arrives; while the vault is closed, the contents are just an encrypted block.
What happens if both the vault keeper and its watchdog go down at the same time?
The vault stays open. On the next visit, the keeper finds and clears the previous leftovers before asking for the password, logging a warning about the leftover process and mount.
Did the nine tests confirm the vault always closes?
Yes. After every test, the vault was closed, the intake area was empty and off-limits, and the work log showed only the in-use mark.
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