However, even with HTTPS they can see what IP addresses you are sending/getting data from (which usually will let them tell what domain e.g. If you visit HTTPS sites only, they can't decrypt the data (unless they have somehow additionally compromised your computer). Or have their own computer/router that they fully control that sends impersonated messages as you or your router. Granted anyone nearby can always interfere and cause denial of wifi service without knowing your password (e.g., often turning on a microwave oven will interfere with all wifi traffic being sent to you). They can also interfere with the traffic being sent to you (e.g., alter the content you see). They would typically run a packet capture program like wireshark to decrypt the wifi encryption.Īgain, they'd be able to see what HTTP webpages you requested, what links you click, the HTML content of the webpages you requested, any information you post to a web site, as well as all data (e.g., any images/movies) sent to you or by you. They can, however, observe all the data being sent to and from your computer (I'm assuming for WPA/WPA2 they observed the 4-way handshake at the beginning of each session or trivially forced your computer to start another handshake), unless you encrypted that data using a protocol like HTTPS. They can't see anything on your screen (unless you've enabled some sort of unencrypted remote desktop screen sharing program). If someone knows my wifi password (be it WEP or WPA) what can they see on my screen? Do they just see URLs I visit, or can they see everything in my browser.or can they see everything I do on my computer? Does using HTTPS make any difference?
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