If I remember correctly, the Snowden dumps showed that the NSA could corrupt a processor / motherboard in such a way (overheating via overclocking?) that the c

If I remember correctly, the Snowden dumps showed that the NSA could corrupt a processor / motherboard in such a way (overheating via overclocking?) that the computer would turn into a small radio that could transmit for miles. This would allow exfiltration of data even if not connected to the internet.