In Applied Cryptography, Schneier says obscurity is "take a letter, lock it in a safe, hide the safe somewhere in New York". Somehow in my mind, cryptography,

In Applied Cryptography, Schneier says obscurity is "take a letter, lock it in a safe, hide the safe somewhere in New York". Somehow in my mind, cryptography, eg. RSA, is also obscurity then. But instead of obscuring the physical coordinates in the set of coordinates of New York, we obscure the location of the private key in the set of prime numbers.