how can I change SNMP v3 encryption

I need to change all nodes in Solarwinds from DES56 to AES, How Can I do that.

when I create an node, SNMPV3 setting are in props{} ('SNMPv3PrivMethod') and use swis.create('Orion.Nodes', **props).

but I can't see those data fields in Orion.Nodes. but find them in NCM.node 'SNMPEncryptType'

Can you please tell me which database/field and function to change it; I use python?