Hi guys

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When your on a Windows computer and there is open Wifi networks around you (not using any encryption), you will see the message "Information sent over this network might be visible to others". Yet when you are at a hotel that uses an open network (not using any encryption), but instead uses some kind of Captiv portals to validate their users, this is not shown.

This leds me to believe that some flag in the beacon frames from the AP must tell the windows computers that this is an secured network. Is this correct, and can anyone tell me exactly what in beacon frame, windows validates on?

I'm aware that the Beacon frame contains the type of encryption used. Using this file as an example:

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If this is what is uses by Windows to validate on what, how would a beacon fram from a en unencrypted network with Captiv portals look like?