I aways wondered if the communication channel between my wireless keyboard and the usb receiver-antena is secure. I never bother to reseach this. Today I figured out the practical way. I turned on my pc at work and I tried to type the first letter of my password. Nothing hapened. Then I started spamming that letter. Still nothing, until the person next to me said “my keyboard is typing all by itself”. It turns out she has a wireless mouse with a seemigly identical receiver-antena usb.
The moral of the story. If it was so easy to almost leak my password unintentionally due to this flaw of wireless keyboard communication, imagine wad a bad actor can do intentionally. Why try to brute force, social engineer e.t.c. when your password can be stollen in transit from your keyboard to your pc.
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My Wireless keyboard is a Keychron. It doesn’t have a dedicated adapter, it’ll connect to any device with Bluetooth capabilities. From what I’ve seen of how it works, is that it can store up to 3 device signatures to automatically connect to (you can choose which of the three is active). What I assume it’s storing is the MAC address which I thought is unique to the device.