When someone sends a message to another WhatsApp user, their device creates a different session key for each device the receiver is using, thus telling the sender how many devices the receiver is using.
So like any other service using the Signal protocol, or am I wrong?
Water is actually not wet. It only makes other materials/objects wet. Wetness is the ability of a liquid to adhere to the surface of a solid. So if you say something is wet we mean the liquid is sticking to the surface of the object
Tal Be’ery, the co-founder and CTO of crypto wallet maker ZenGo, found that it’s possible to determine whether a user on WhatsApp is using more than just the mobile app.
Be’ery demonstrated and proved his findings in tests performed with WhatsApp numbers controlled by TechCrunch.
“[It] could be useful for information gathering and plotting an attack,” Runa Sandvik, a digital security expert, told TechCrunch, referring to how hackers could figure out that their target is using WhatsApp on a desktop, which is generally an easier target to compromise than a mobile phone.
“It at least tells you more about the devices they use and how ‘accessible’ their WhatsApp setup may be,” said Sandivk, who is the founder of Granitt, a startup that aims to train at-risk people like journalists, activists, and politicians.
Meta’s spokesperson Zade Alsawah told TechCrunch that the company received Be’ery’s research and concluded that the app’s current design “is what users want and expect.”
Anyone can find out this kind of information by using WhatsApp on the web and inspecting traffic with a browser’s developer tool, Be’ery explained.
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This isn't new, interesting or noval information. If you run whats app from the desktop app or from web.WhatsApp.com on you're browser on a PC then no shit they know your on your PC
Why does it matter if the people I'm chatting with know if in onnmy PC?
This is a security feature to let you know that the sender may be an imposter, right? Like matrix's verified sessions, if my friend gets a new phone or pc it's unverified and I have to verify the new session through another means, like in person or phone.