Why does everyone keep posting about the NSA taking over bitcoin. Am i missing something? There is NO WAY that one could achieve 51% of the mining rate. It would be absurd and overall and not cost effective as they would continually have to reinvest in equipment to maintain their mining rate.
The hash rate is double about every 50 days currently.
So 50% of current hashing were added in the past 50 days.
I think a 51+% attack is super easy if you have the necessary determination and funds.