^^ Wow at the amount of bullshit posted there.
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?
Yes in theory but not for now. The Shor's algorithm makes is possible for quantum computer to bruteforce the Bitcoin private key from the bitcoin public key. This puts those with reused address or with P2PK transactions at risk. However, up till now, no one has even got close to creating a quantum computer that is possible to bruteforce the private key with less difficulty.
No. Quantum computing will not be able to bruteforce private keys significantly faster nor mine faster or create a SHA256 collision.