Once quantum computers crack traditional cryptographic algorithms can't quantum computers also be used to make new ones? Isn't that what that summary pretty much implies?🤔
The question would be whether modern consumer computers will be capable of implementing post-quantum cryptographic algorithms. At the moment, I don't believe many can.
Post quantum cryptography exists in a way that we know algorithms that run on traditional hardware and are safe from quantum computers. They’re just not widely used.
Source: my ex did her PhD in that area and told me.
The problem is in theory not as big as it sounds. Quantum computing takes away one exponent. Meaning it reduces a complexity of 2^x to x.
But it also reduces 2xy only to x^y.
And we have cryptography that features that complexity, too.
In practice, quantum computers still are a very tough challenge, because our 2^x algorithms are virtually everywhere, and going through that is a similar effort as was the y2k problem, only with much much much more code, because y2k was 23 years ago