This version of the data-exfiltration attack against air-gapped computers involves the machines fans.
The malicious code developed by the researchers can use the devices fans to exfiltrate data.
They can also use low or close frequencies, which are less visible.
It is possible to have better transfer rate by increasing the frequency in the Fansmitter.
At 4000 4250 RPM, the team transmitted 15 bits per minute over a one-meter distance.
source: www.techworm.net
