HP Commercial LaserJet Printers and MFPs - Imaging and Printing Security Best Practices

Chapter 4 HP LaserJet and Color LaserJet MFP Security Checklist 67
If you choose Simple for the bind method, usernames, email addresses,
passwords, and other data will be sent over the LDAP protocol in clear
text.
Fill in the remaining fields according to your network configuration.
If your network has Kerberos authentication capabilities, configure the Kerberos
Authentication options.
User Pin Authentication
User PIN Authentication allows you to restrict access to MFP functions by specific users. A user will
be required to log in by PIN in order to use a restricted function on the MFP (see the
Authentication Manager section above). This feature also provides a way to add user email
addresses to the MFP address book. You can configure up to 2000 users in this feature.
Configure User PIN Authentication (Figure 62) as desired.
Figure 62: The User Pin Authentication options.