There is no security on the network. If you get on the internet, there is no protection. Encryption can be defeated, so whatever is on your hard drive can be read by others.

Work under the assumption that if you are going to be on the internet, whatever you do is unsecured, and whatever is on the machine you are accessing the internet with is unsecured. The only thing that is keeping your information and activities from being compromised is that you are a little fish, and not worth the effort for the moment, but that could change at any time.

Consider it a fact that someone(s) have already hacked your machines, looked to see if you have anything they are interested in, and probably moved on due to lack of interest. They have a list of all your passwords and should any of them ever want to get back into your system they can at will. The most likely hackers: government agencies.

Work under that premise, and you know where you stand.

There is no "secure" on the internet, regardless of what connection you are using.