If it makes you feel better, no cryptographic assumptions we use today are known to be NP-hard. Or maybe that makes you feel worse, not sure. But it doesn't rea

If it makes you feel better, no cryptographic assumptions we use today are known to be NP-hard. Or maybe that makes you feel worse, not sure. But it doesn't really matter because NP-hardness is a statement about worst case inputs and cryptography needs guarantees about average case inputs since keys are generated randomly.