0.3.2 has some security safeguards to lock in the block chain up to this point and limit the damage a little if someone gets 50%.
But if someone has 50%+ of the CPU power and malicious intent, they can prove what it already says in the design document.
BitcoinTalk
#11From:
satoshi
Subject:
Re: Nenolod, the guy that wants to prove Bitcoin doesn't work.
Date: