OpenAI researcher Noam Brown has highlighted a potential security vulnerability involving air-gapped computers. According to academic research, two physically isolated PCs placed in close proximity can establish a covert communication channel by manipulating hardware temperatures.
The process relies on the thermal output of processors. A transmitting device increases its CPU load to generate heat, while a receiving device monitors its own internal temperature sensors to detect these fluctuations. By modulating heat output in specific patterns, the devices can transmit data similar to Morse code.
This method exploits standard hardware components, as modern CPUs, GPUs, and motherboards are equipped with temperature sensors for thermal management. While the bandwidth of this channel is extremely low, the findings suggest that physical isolation does not entirely eliminate the risk of unauthorized data exchange between adjacent systems.
