Let's say I connect to my schools WiFi, and I log into Facebook. Could they see my login information, my messages and what not? I know they could see what applications you are using, but I'm still not sure if they can see your messages, including regular SMS texting.
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4Do you have to install any software on your computer to use their network? – Johnny May 26 '16 at 21:43
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For sites that use HTTPS, the owner of the network (the school in your case) can see what domains you visit, e.g. facebook.com, but not what you do there - what pages you visit, what Friends you poke, what password you enter, etc. Facebook, Gmail, etc. use HTTPS.
For sites use HTTP instead of HTTPS, your school can see all of the above, including your password. They can also modify the content you see.
There is one caveat though. If your school has made you install a certificate on your phone or computer, or some other software for that matter, your HTTPS traffic is no longer safe.
Ordinary SMS messages are not sent over WiFi even if your phone is connected to one. Instead they are sent over the mobile network.
Anders
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1+1 for pointing the certificate situation out. This can break everything. – Potaito May 27 '16 at 07:11