... what? I am not sure what your idea aof cryptography is, but crypto relates to the most basic of questions about computation: what is and isn't efficiently

... what? I am not sure what your idea aof cryptography is, but crypto relates to the most basic of questions about computation: what is and isn't efficiently computable, that is, P ?= NP. You do realise that the origin of the field of Computer Science lies in mathematics, specifically Turing's work, right? By your argument, the entire field of Theoretical Computer Science is ... not a part of computer science. Some how, I think that that's not quite right.