I'm saying that working on Cryptography can also be a solid math education. You can start with very basic high-school math; primes and finite fields, extend to

I'm saying that working on Cryptography can also be a solid math education. You can start with very basic high-school math; primes and finite fields, extend to algebra, formal logic, information theory, codes, probability, elliptic curves, isogenies, lattices. They can build on one another, but by actually building some things. It's a great way to learn.