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X.509 and the Certificate Authority Model of Internet Trust
X.509 turned public keys into signed identity statements and helped create the certificate-authority model that browsers and servers use to establish trust across the Internet.
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X.509 turned public keys into signed identity statements and helped create the certificate-authority model that browsers and servers use to establish trust across the Internet.
Let's Encrypt combined a nonprofit certificate authority with the ACME protocol to make domain-validated TLS certificates free and automatable, shifting HTTPS deployment from a manual purchasing task toward routine infrastructure automation.