Why sign as well as encrypt files stored on untrusted drives?

[Jerome Baum]

> Say I encrypt a file to myself using my public key,

> Is there some feasible attack that could change the encrypted data in
> such a way that I won't notice it when I decrypt the file, but somehow
> the file will still decrypt?

You've said it yourself. The attack is to encrypt something else to
your public key.

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