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

Chapter 3 HP LaserJet and Color LaserJet MFP Security Checklist 18
Figure 10: The Enable SNMPv3 option has been selected and the New SNMPv3 Credential section is complete.
The New User Name field can be any name you choose.
The New Authentication Passphrase field can be any word or phrase that is at least 8
characters.
The New Privacy Passphrase field can be any word or phrase that is at least 8
characters.
CAUTION:
These instructions are for the initial configuration of SNMPv3. Once you
finish this configuration, the MFPs will require these credentials
whenever anyone attempts to access settings over the network. Be sure
to remember these credentials and provide them only to authorized
users. If these credentials are forgotten, the only way to restore
communication between HP Web Jetadmin and the MFPs is to restore
the MFPs to factory default settings.
Web Jetadmin retains the SNMPv3 credentials for each MFP, and it will
not prompt for them as long as the settings remain the same. You can
clear the Web Jetadmin Device Cache to cause Web Jetadmin to
require the credentials again. Web Jetadmin stores the SNMPv3
credentials in an encrypted form.