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> That way you can make individual powerful passwords and keep them in a txt file without putting them in risk.
But having them on a txt file on the actual drive, even on linux, may still encounter the odd malware that you can install through a wallet downloaded from a wrong site. Whats more, even if isolating the computer as much as possible will mitigate risks, theres still the risk that someone grabs/steals your physical computer, and mounts the linux disk as a secondary device to access the content, gaining access the txt file.
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Well, then use a brand new usb flash drive to save it there and use it exclusively with that PC. Downloading anything infected with malware is user's fault. Hence avoid downloading anything from that computer. And of course, having a genuine licensed antivirus will prevent most of the malwares beign installed.
If someone steals a PC, there is no much you can do about it.