Netgear M7300-24XF (XSM7224S) - ProSAFE 24-port, 10 Gigabit Stackable L2+ Managed Switch Software Guide

If SNMPv3 authentication is to be used for this user, the password 

must be eight or more alphanumeric characters.

To enable authentication, in the Authentication Protocol field select either MD5 or SHA for 
the authentication protocol.

If you do not need encryption, go to Step 9.

To enable encryption select DES for the encryption scheme in the Encryption Protocol 
field. Then, in the Encryption Key field, enter an encryption code of eight or more 
alphanumeric characters.

Click Apply.