Comment Re:Do We Have Quantum Computers For this? (Score 1) 10
I didn't think that we had quantum computers already. [...] Is it still theoretical and prophylactic, or does this stuff exist today and have real world possibility now?
We do, actually, but they're far too small and far too unreliable to pose a current threat. That said, with something like the Internet, which takes decades to upgrade core components, if you wait until the problem exists before you try to solve it, you're gonna be in trouble.
It's still possible that quantum computers will never be practical, but there's been significant progress over the last few years that makes it seem like it probably will happen. If you have anything that relies on asymmetric cryptography and you still want it to be secure in 20 years, you might want to start looking into post-quantum algorithms now.