this post was submitted on 27 Aug 2024
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Not sure if I used the correct terms but what is the difference in security and privacy between downloading from a public wifi (or a closed wifi; with password) and mobile hotspot (sharing 4G/5G data from your phone to your computer)? Which one is recommended or does it not matter?

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[–] Tetsuo@jlai.lu 3 points 2 months ago (9 children)

I have no idea what this client separation is.

As far as I know there isn't really any client separation on wifi. It's a shared medium.

At least I don't see anything preventing you from reading someone else traffic. So anything unencrypted on a wifi is also accessible to any other clients.

I had tools more than 10 years ago that could automatically hijack session cookies on wifi for anybody connected and not using https.

[–] qprimed@lemmy.ml 5 points 2 months ago* (last edited 2 months ago) (7 children)

no worries.

the net effect of client separation is that your device sees no other layer 2 devices on the wlan besides the gateway. this would typically be enforced at the frame level by the APs and is separate from any radio privacy cryptography.

a properly configured wireless setup would assume every client is compromised and would also disallow local client-client via source routing or proxy ARP or any other escape options. 100% secure? probably not, but its a non trivial barrier that would have to be circumvented.

as with e.g. broken WEP years ago, there are still options to mess with clients at ~Layer 1 but I dont believe its currently as trivial as it used to be.

[–] Tetsuo@jlai.lu 5 points 2 months ago (5 children)

Do you have any documentation on how this work ? Is there a name to this special protocol? Is it a recent addition to the wifi standard ?

Again a wifi AP doesn't send data to a specific client. So how does an AP can enforce that one client can't read a frame for someone else that is properly authenticated? How would an AP prevent someone spoofing mac addresses from receiving that data ?

I'm really confused by this feature I never heard of even when I was playing with aircrack and so on. Yes sometimes your mac address can get filtered but even that is not really difficult to avoid.

Sorry I have so many questions but I honestly did quite some "tinkering" with wifi years ago and none of this sounds familiar.

[–] tgxn@lemmy.tgxn.net 3 points 2 months ago

Client seperation is implemented by the AP. There's lots of info, it's called client isolation normally. check this out

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