Securing SNMPv1 and SNMPv2c

Hi there,
We have a SNMPv3 where we can apply the AuthPriv level security to secure the SNMP traps. But, in order to provide the security to earlier versions, would it possible to apply any of these security levels to SNMPv1 and SNMPv2c traps instead upgrading to SNMPv3?
Could you lead me to any documents if any.

Thanks v much!

No, that is not possible at all, because SNMPv1 and v2c have no security built-in at all. No authentication and no privacy (encryption). Thus, everything is send in plain text on the wire with these two versions.

Thanks AgentPP.
I got to read something which is TLS/TCP based:

Any thoughts on this?

How is this related to this topic? (I do not get your point)