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A lot of people, myself included, use #airgapped systems for high security. But their #security isn't perfect, and their usability isn't, either. In "How Gapped is Your Air?", I discuss airgapped systems, their pros and cons, and surprising ways of getting data to or from them: everything from #serial lines to speakers and microphones. https://changelog.complete.org/archives/10571-how-gapped-is-your-air
Can you tell I've been thinking about this stuff a lot lately? 
Also in that article, I discuss tools like #dar, #kermit, #gensio, and #NNCP that can help you carry data to or from sensitive systems without using a traditional network. Also I mention data diodes (#datadiodes) - hardware devices that let data flow in only one direction. Interesting ideas there. https://changelog.complete.org/archives/10571-how-gapped-is-your-air