Theoretical attack can steal data from air-gapped devices
A new theoretical attack developed by Korea University involves using the built in speakers of a computer to transmit data to a smartphone even if the computer is not connected to the internet. The attack uses high pitch frequencies undetectable by humans to send data from an infected computer to a smartphone. https://www.bleepingcomputer.com/news/security/casper-attack-steals-data-using-air-gapped-computers-internal-speaker/