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.<p>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)?<p>See also <a href="https://news.ycombinator.com/item?id=28394826" rel="nofollow">https://news.ycombinator.com/item?id=28394826</a>. These aren't "attacks" - these are methods of data exfiltration between two compromised devices. There <i>are</i> attacks that e.g. steal private RSA keys by capturing the EM radiation during cryptographic operations, but this is not that.