This MIB extends the OID's for SNMP-USM-MIB
specified in RFC 3414.

The privacy protocol OID's specified herein 
are intended to be used as values  for 
usmUserPrivProtocol when managing SNMPv3  
users via the snmpUsmMIB.

This MIB defines the OID's for the following
encryption options:

       * 192 bit key size AES
       * 256 bit key size AES
       * 168 bit key size 3DES.

OID for 128 bit key size AES encryption is 
defined in SNMP-USM-AES-MIB as per the 
RFC 3826.