We have created a SCADApedia entry on Secure DNP3 as a companion to the recent podcast with Grant Gilchrist. We should have a DNP3 entry up in the next day or so for those new to the protocol.
Also don’t forget the DNP3 IDS signatures that have been deployed in many of the commercial IDS and are available to subscribers for the Snort IDS signatures. I found it interesting that most of the function codes that required mandatory protection in Secure DNP3 matched the function codes we focused on in the IDS signatures. Of course the IDS signatures provide attack detection while Secure DNP3 provides protection from attacks.