So what this is saying is that the FBCA has been compromised giving bad actors complete access to all Federal systems allowing them to basically order up forces at will by faking certified orders. Not only that they would be able to fake any certificate in the Federal CA giving them access to anything that relies on it.
It looks like HRC sold a bridge to the USG Federal Certification Authority system to Serco who then connected it to their own TOR ONION router. Basically Hillary sold a bridge between the Dark Web and the entire US Government network.