7 points
Email is tied to domains. TLS is tied to domains. CORS is tied to domains. OAuth is tied to domains. Those are just four things I can think of while half asleep. Here’s one recent example of how screwing up a domain name is enough by itself to cause a security breach.
Cryptography is not security any more than domain names are; both are facets of how security is implemented but there’s no one system that makes the Internet secure.
