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Make a separate account on your Mac for just this purpose.

Be aware that any valid normal user account password can decrypt your hard diskā€”the exception being a guest account which forces the entire computer to restart into a separate, fully neutered system.

But someone at airport security turning the computer on still wouldn't have access to your user's files, presumably (?), because of user permissions - so they'd need to hack it (illegally, I expect) and why would they do that? In the context of this story aren't they just checking the serial number, presumably that's printed on the case?

Assuming you haven't switched partition schemes to something like LUKS with pre-boot authentication.

I'm assuming it's a MacBook that is being operated normally by a normal person.

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