[Bug 1928860] Re: Recovery key is low-entropy

[Brian Murray]

** Tags removed: rls-ii-incoming
** Tags added: rls-ii-notfixing

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubiquity in Ubuntu.
https://bugs.launchpad.net/bugs/1928860

Title:
  Recovery key is low-entropy

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 21.04 Desktop ISO includes Ubiquity installer which offers the
  user to set up full-disk encryption. In this set-up a recovery key is
  automatically generated and added to the system.

  The recovery key is 16 decimal digits or ~53.2 bits of entropy so
  within capabilities of offline brute-force attacks for well-resourced
  attackers.

  To confirm, the key is generated here:
  https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/plugins
  /ubi-partman.py#n306 and used here:
  https://git.launchpad.net/ubuntu/+source/ubiquity/tree/scripts/plugininstall.py#n915
  (see also the attached screenshot).

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1928860/+subscriptions