turkey3_scratch :
nings :
Not even bitcoins but bank acces, certificates and all things who protect our datas..
And without a quantum processor you can't encrypt all your data with a quantum key because take too much time for encrypt/uncrypt the message. The futur is pretty bad for security.
If you are implying something along the lines of password cracking via trillions of attempts per second, something like this is avoidable through time delay implementations.
It's not about brute force guessing a password really quickly, it's about breaking the encryption itself.
For example, AFAIK a lot of public key cryptography is based around the difficulty of integer factorization for traditional computers. Public key cryptography forms the basis for most encrypted electronic communication. Quantum computers have the potential to be much faster at factorization than traditional computers, and thus can break said encryption.
Or to quote wikipedia:
"The problem with currently popular algorithms is that their security relies on one of three hard mathematical problems: the integer factorization problem, the discrete logarithm problem or the elliptic-curve discrete logarithm problem. All of these problems can be easily solved on a sufficiently powerful quantum computer running Shor's algorithm."
https://en.wikipedia.org/wiki/Post-quantum_cryptography