It kind of boggles my mind how quantum safe encryption is even a thing that can be achieved, especially without the use of quantum computing itself.

Does anyone know a good basic primer for someone who understands standard encryption (just) but isn't any kind of computer scientist / theoretical mathematician etc?
@Tutanota

Not... really.

The blog post says what projects are being used to encrypt, but the only mention of how is one sentence about that they use problems considered "too difficult" for a quantum computer to figure out. There's no mention, not even a sentence, of what kind of problem or why it would be difficult, which is exactly what I'm wondering.