A loopback device is a very special device that allows you to mount a normal file as it was a physical device. loopbacks can be encrypted: this becomes very useful sometimes.
Consider, as na example, that you need to encypt a few files, nothing big, let's say 100 MB or so. Encrypting an entire partition could be too much. Then a cryptoloop could be the right solution to your problem.
By Marco at PC Nerds.
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