I'm sure we can think of a "double lock" feature, where you allow a friend to lock you out of your account.
There's even an easy local solution: encrypt your data with a friend's public key (sealed box in libsodium parlance). It may be seized and intercepted, but you can't possibly decrypt it.
That's probably the kind of scheme Snowden used when he arranged his inability to decrypt his NSA data even if captured and tortured by some foreign country.
Yeah, that's the downside of carrying stuff that you can't decrypt. They won't believe you, and won't stop until you decrypt it. Better is not to have anything sensitive with you.
Encrypted volumes look random. There's no way of proving whether or not you have something you can't decrypt. Hence the need to have some innocent volume to decrypt as a tool in the argument to convince an interrogator that you have nothing left to hide.
Better yet, fill every hard drive with random junk before formatting and selling them. If everyone has random data in their free space, it won't even look suspicious.
I don't mean normal online accounts. I mean something like the WikiLeaks upload site.[0] Once stuff is uploaded, you don't have control, or even access.
There's even an easy local solution: encrypt your data with a friend's public key (sealed box in libsodium parlance). It may be seized and intercepted, but you can't possibly decrypt it.
That's probably the kind of scheme Snowden used when he arranged his inability to decrypt his NSA data even if captured and tortured by some foreign country.