One-time pads are unbreakable, so unbreakable cryptography exists. Impagliazzo's Five Worlds are only about public key cryptography. If public key cryptography

One-time pads are unbreakable, so unbreakable cryptography exists. Impagliazzo's Five Worlds are only about public key cryptography. If public key cryptography didn't exist, we'd still be arguing about private key cryptography.