> SD card vs. internal: I'd rather have my profile unencrypted on an SD
> card than unencrypted on the internal memory.

Conceal is trying to address the problem that _any app on your device_ can read 
from the SD card at any time.

Its solution is to keep the keys in SharedPreferences (which is on-device, 
protected by the OS), and put encrypted data on the SD card, effectively 
extending the OS’s protection to SD card storage.

It’s not perfect security — the app, the OS, and arbitrary other things on a 
rooted device can get the keys — but it changes things.
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