[Cryptography] Wrong uses of filesystem encryption

[Ryan Carboni]

>From Michael Kj?rling:

> Encryption does you no good if the adversary has the ciphertext _and_
> the key, or has the ciphertext and is able to recover the key,
> especially if the algorithm is known or can be reverse engineered. Cue
> movie DVD CSS DRM for just one example.
>

Which is why you store keys in hardware, not in hardware.
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