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by gligorot 1750 days ago
What about secure key import on Android? It's still not that widely available, but should be everywhere in a few years. The idea is:

-a keypair is generated in secure hardware

- you send the public key to a server which encrypts the secret key with it

- the server sends the encrypted key back

- then it goes inside the secure hardware where it gets decrypted

The decrypted secret key is never in the userspace.