[hevi_jos]

I believe you are forgetting something important: humans. You are focusing in technology without people.

Technology without people does not work. Specially in China: http://imgs.xkcd.com/comics/security.png Most devices in China cheap enough are compromised as they are manufactured by the Government, the channel is compromised. The apps are compromised, social media is compromised.

You can trust no body but your family, as simple as that, not even your family as the Government can blackmail them.