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Comment by ethbr1

6 days ago

(Don't take any of the below in a negative sense! It's awesome you built a privacy-first solution and care about these things, to the extent practical. Below just musings)

I assume the attack vector here is more along the lines of 23andme bankruptcy -- if developer is bought by a new corporate entity / priorities change, what guarantees exist that privacy architecture won't backslide via updates?

Users shouldn't be concerned that a minor update or corporate sale will change the bargain they made around their privacy.

Honestly, it'd be great if there were scaled third-party cloud key escrow services coupled with enforced legal guarantees.* ^

It feels like we did cloud wrong from a legal/privacy perspective by not separating keyholder from data-at-rest-holder (legal entity wise). Tenant-based encryption is basically there... just still mingling data and key ownership in the same entity.

GDPR / right to be forgotten would be trivial if there were always a third party (who enforced requirements on any first party) I could submit a request to, that would burn my keys on their side, thus rendering first-party stored data un-practically-retrievable.

(And a third party because, similar to the browser+CA system, balancing power against each other to enforce guarantees of good behavior seems effective)

* Legal guarantees like "no caching keys for longer than X" or "no unencrypted user data at rest"

^ Cloud hosting encryption keys would also solve the ugly UX edge of strong encryption around "I lost my key... help?"

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ethbr1

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fn-mote  6 days ago

This is a wonderful comment, but also ...

Is there a way to prevent future versions of the app from uploaded the locally saved data? Even if none if it was in the cloud to begin with?

That's the route I would be most concerned about.

After that, I agree with the rest of your comment.

  • ethbr1  6 days ago

    Blocking network access by a specific app at the OS level would be the way to achieve this.

    I don't believe iOS currently has this ability (all network, not just cellular).

    Android has solutions like NetGuard.