Let me take a crack at it: "... is what's called NP-hard. That means that finding the answer is at least as hard as cracking a very strong cryptographic key,

Let me take a crack at it: "... is what's called NP-hard. That means that finding the answer is at least as hard as cracking a very strong cryptographic key, something that is currently considered too computationally expensive to be practical." Would that be a better explanation, understandable by the article's target audience?