that line struck me as well. its kind of a philosophical statement, actually. mathematics is a formal logical system but nothing in computing is pure mathematic

that line struck me as well. its kind of a philosophical statement, actually. mathematics is a formal logical system but nothing in computing is pure mathematics, even if the theory of computing and the theorems of cryptography are expressed in mathematics. ultimately a machine is actually DOING the cryptographic operations and that solidly brings it into the realm of physics.