Do not use default options for the scrypt utility!

Here is example with more secure options:

$ sudo apt-get install scrypt
$ scrypt enc -M 1073741824 -t 200 secret.txt encrypted.scrypt

If you have several GB of free memory you can increase the memory usage several times.

My tests confirm that the "-t" parameter is not working correctly - it takes less than 200 seconds to derive the key from your password.

Archiving private keys - TLDR version

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Archiving private keys - TLDR version