[anologwintermut]

Computer security in general has almost nothing to do with math. Cryptography specifically obviously does (the security and cryptography communities are pretty distinct). However, cryptographic engineering, which is what you would do with just an undergrad degree, has almost nothing to do with math at all.

Cryptographic research, on the other hand, can be math heavy. However, it typically draws on pure rather than applied math. E.g. number theory(RSA/factoring), algebraic geometry(ECDSA/elliptic curves, pairings over elliptic curves), and ideal latices.