All cryptography is vulnerable to a technique canonically called "rubber hose cryptography," which is where you beat someone with a rubber hose until they give

All cryptography is vulnerable to a technique canonically called "rubber hose cryptography," which is where you beat someone with a rubber hose until they give you the key. It's so effective it can even break post-quantum algorithms without a quantum computer! Governments have plenty of rubber hoses, and guns. The idea that non-technical people with no infosec / netsec / tradecraft knowledge could use any form of crypto within a regime that banned it aggressively without placing themselves in massive jeopardy is the height of looney tunes techno-utopianism. Keep in mind that these are usually nations that lack little things like habeas corpus, due process of law, or in some cases any rule of law whatsoever. If the government doesn't like what you are doing they disappear or kill you.