Let me avoid the technical aspects to make things easy for all readers.
So someone said that America's NSA has this great computer(quantum computer) that could easily hack Bitcoin private keys. I really doubt his claim but I know for sure that certain computers like the most powerful Super Computers are within the reach of some of this Intelligence organizations.
Do you think such computers can crack any security codes put in place to make Bitcoin very secure?
Of course it can if it generates your key pair... I think that they could and can. But still the question is how many years will they need. I still believe that it will take at least 50+ years, or I underestimate their computers.
It's not about the power of hardware. It is based on the code on blockchain where you have to gain access into it. I think hacking bitcoin will not likely to happen as we know the technology of blockchain you can be traced as it is the use of blockchain, to trace transactions.
Do you know anything about private keys and public addresses within bitcoin protocol? Yes it is hard to change the transactions but I think that this guy asks about the private keys. We all know that they are generated randomly and because of it (because there are to many combinations) for regular computer it can take a lot of years to go through all private keys which makes it to not be worth trying at all. But on other hand if you have quantum computer or even some really strong super computer you can start to guess randomly keys and you could end up with an address with coins that are related to it. More info
https://bitcoin.stackexchange.com/questions/2847/how-long-would-it-take-a-large-computer-to-crack-a-private-key