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Just for the record, asymmetric cryptography is not efficient for encrypting content. What you should do is:

- Generate a temporary key

- Symmetrically encrypt with that key

- Encrypt that key with your long-term assymetric private key, and send the encrypted version along your backups.

And before you hack around your own version, I'd like to point out this is exactly what PGP (and really, any crypto scheme that involves asymmetric keys) does. So, basically, just GPG your backups.




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