SNMPv3 updating keys
SNMPv3 offers the capability of updating user keys based on new passwords dynamically.
This is done by using the pwchange command to generate new user keys based on an updated password, using the clsnmp command to dynamically update the user key in the /etc/snmpdv3.conf file, and editing the /etc/clsnmp.conf file with the new keys. During this process, the new password is never communicated between machines.
For step-by-step instructions on updating user keys, see Dynamically updating authentication and privacy keys in SNMPv3.