A password is a best-effort attempt at implementing the theoretical construct of a 'cryptographic shared secret'. Passwords are from perfect at that of course,

A password is a best-effort attempt at implementing the theoretical construct of a 'cryptographic shared secret'. Passwords are from perfect at that of course, but it's not correct to call them 'obscurity' either. The distinction between security and obscurity derives from Kerckhoffs's principle. https://en.wikipedia.org/wiki/Kerckhoffs%27s_Principle https://en.wikipedia.org/wiki/Kerckhoffs%27s_Principle