Air-Gap Attack Turns Memory Modules into Wi-Fi Radios
A few months ago I read a comment lamenting about all of these "novel" airgap "attacks" that are just all variants on the same theme of "figure out a new side-channel to send data between two complicit devices over". You can use memory module busses, power/camera/keyboard LEDs, fan speeds, ultrasound emitted from speakers...it's not very interesting, at this point.I bet that I can come up with a new one off the top of my head...alright, how about malware that imperceptibly dims/brightens the screen, which could be interpreted as a 1-bit symbol and picked up even when the screen is facing away from the receiver (by observing the reflection off of a nearby surface)?See also https://news.ycombinator.com/item?id=28394826. These aren't "attacks" - these are methods of data exfiltration between two compromised devices. There are attacks that e.g. steal private RSA keys by capturing the EM radiation during cryptographic operations, but this is not that.