In a previous article, I talked about using
shred to securely delete files. Now we’ll delve into using encrypted volumes in Linux to secure our data in the first place, so that we don’t need to use programs like
shred. Along the way, we’ll benchmark the raw performance of an encrypted volume and compare the results to an unencrypted volume and see just what kind of real world compromises we see.
To start out we need free space on a drive that isn’t partitioned, or enough patience to resize an existing one. Just about everything here needs root privileges, since we’re working with filesystems. It would be easiest to start a root terminal with
sudo su, then enter your password.