1

This is a way I enter a new passphrase for my encrypted volume:

sudo cryptsetup luksAddKey --key-slot 4  /dev/sda5

Unfortunately, cryptsetup does not ask to confirm the new passphrase. How to make sure that the passphrase I have entered is the one that I actually meant?

I see two workarounds.

  1. Reboot and try the new passphrase.
  2. Add a temporary passphrase to another slot with the help of the new passphrase. Kill the temporary passphrase.

Is there a more elegant way?

1
  • 1
    --verify-passphrase... – jasonwryan May 7 '18 at 8:14
3

Just run cryptsetup with argument -y.

From the manpage of cryptsetup:

--verify-passphrase, -y
    query for passwords twice. Useful when creating a (regular) mapping for the first time, 
    or when running luksFormat. 

The system would ask twice for an existing passphrase and for a new one:

$ sudo cryptsetup luksAddKey -y --key-slot 4  /dev/sda5
Enter any existing passphrase: 
Verify passphrase: 
Enter new passphrase for key slot: 
Verify passphrase: 
Passphrases do not match.

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