> I could imagine a post-quantum computing era where it is even possible to know, with certainty, if you have been hacked, or data breached, because of quantum

> I could imagine a post-quantum computing era where it is even possible to know, with certainty, if you have been hacked, or data breached, because of quantum cryptography. How so? (Because none of that seems to even remotely have anything to do with quantum cryptography. It's a key exchange - and one with some very bad properties I might say, because it assumes a hell of a lot of things already existing like an authenticated channel. But it does nothing to detect breaches or whether you've been hacked.)