The OP has some pretty wild ideas but some of it is definitely worth thinking about.
Bitcoin is a thorn in the side to the Chinese government and they're pretty hell-bent on removing it from the Chinese currency market. Look back to what they did to the Chinese Bitcoin exchanges last week. Their government doesn't like Bitcoin because it kind of alleviates the cap on the amount of money people can send out of the country, plus it's anonymous.
I believe the single biggest threat to the future of Bitcoin is the potential for Chinese government-sponsored sabotage of the Bitcoin network. They are believed to have stolen the top secret plans for America's stealth fighter planes and aircraft carriers, so I doubt Bitcoin is going to be too difficult for them to break, if they really wanted it to.
No, this doesn't work this way and that's probably why China is so harsh towards bitcoin. If you know some encryption algorithm, this doesn't automatically mean that you can decipher everything encrypted with it (we are well past those good ol' times). That's how the matters stand with bitcoin...
Welcome asymmetric cryptography