The Fernet driver is not secure enough because we don't have keys rotations at this time. The RFE here is to provide a solution to perform Keystone Fernet tokens rotation in a way that scales and is secure.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:3462