Semi related. An old exploit on a bitcoin hardware wallet measured power draw to extrapolate the private key, https://hackaday.com/2018/06/11/a-close-eye-on-pow

Semi related. An old exploit on a bitcoin hardware wallet measured power draw to extrapolate the private key, https://hackaday.com/2018/06/11/a-close-eye-on-power-exposes-private-keys/ https://hackaday.com/2018/06/11/a-close-eye-on-power-exposes... Hardware wallets are essentially a kind of highly specialized air gapped computer, so I wouldn't be surprised if a similar exploit could be used for larger air gapped systems. edit; yep, power draw exploits are definitely a thing, https://www.zdnet.com/article/how-safe-is-your-air-gapped-pc-attackers-can-now-suck-data-out-via-power-lines/ https://www.zdnet.com/article/how-safe-is-your-air-gapped-pc...