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I also recommended using an air gap, which physically isolates a computer or local network of computers from the Internet.(The name comes from the literal gap of air between the computer and the Internet; the word predates wireless networks.) But this is more complicated than it sounds, and requires explanation.These attacks work by exploiting security vulnerabilities in the removable media used to transfer files on and off the air-gapped computers.Since working with Snowden's NSA files, I have tried to maintain a single air-gapped computer.It successfully jumped the air gap and penetrated the Natanz network.Another piece of malware named agent.btz, probably Chinese in origin, successfully jumped the air gap protecting US military networks.One thing I didn't do, although it's worth considering, is use a stateless operating system like Tails.
I purchased my computer off-the-shelf in a big box store, then went to a friend's network and downloaded everything I needed in a single session.
It turned out to be harder than I expected, and I have ten rules for anyone trying to do the same: 1.
When you set up your computer, connect it to the Internet as little as possible.
The less software you install, the less an attacker has available to exploit.
I downloaded and installed Open Office, a PDF reader, a text editor, True Crypt, and Bleach Bit. (No, I don't have any inside knowledge about True Crypt, and there's a lot about it that makes me suspicious.