PKI Explained: Certificate Chain and Trust Model
How public key infrastructure works: certificate authorities, the chain of trust, X.509 certificates, and how browsers verify HTTPS.
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Tags: security, cryptography, pki
PKI Explained: Certificates, Certificate Authorities, and Trust Chains When your browser shows a padlock for , it is displaying the result of a successful PKI verification. The browser verified a chain of cryptographic signatures that traces back to a root Certificate Authority it trusts. Understanding this system — how browsers decide who to trust, how certificates work, and how the chain is verified — is fundamental to building and operating secure web services. The Problem PKI Solves Public-key cryptography requires that when you connect to , the public key you receive actually belongs to the bank — not to an attacker intercepting your traffic. Without an additional layer of trust, anyone could generate a key pair, claim it belongs to any domain, and intercept your "secure" connection.…
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