Re: Linux mint and no longer have this sort of problem
For now.
You see, if you can run arbitrary software on ANY platform, then you can encrypt your own files (as pointed out above).
Sure it is less likely on Linux and one reason I migrated, but if you are properly paranoid about this then you will (A) have an isolated backup anyway as that covers hardware failures and "gross administrative misconduct", and (B) set user-writable areas to non-execute so you can't accidentally run something unpacked from an archive (because your were drunk and it promised good pr0n).