Stupid_and_confused

Would you still say it's worth it?

I'm a freshman studying computer science, with a minor in math. I am really interested in crypto, and would love to go to grad school for it. I have read up on quite a bit of modern/classical crypto, but know next to nothing about quantum computation and post-quantum crypto.

As I understand, RSA encryption wouldn't be viable due to Schor's algorithm being able to factor the public key in polynomial time. But, what about other currently used cryptographic schemes such as diffie-helman which relies on the DLP? Why would that be broken due to quantum computation?

To sum it up, I'm curious about what cryptographic schemes would be rendered obsolete by quantum computation, and what types of schemes currently have the most potential for post-quantum encryption.