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Q & A Security · August 15, 2026

What is certificate pinning?

Certificate pinning (also called public key pinning) is when an application hard-codes the expected certificate or public key hash and refuses connections if the certificate doesn’t match — even if it’s from a trusted CA. This protects against rogue CA issuance. HPKP (HTTP header-based pinning) was deprecated; modern apps use pinning in native code.

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What Is an SSL Certificate? TLS, HTTPS, and Trust Explained
SSL certificates are the foundation of HTTPS — they prove you're talking to the real server and encrypt everything in transit. Without one, browsers show security warnings and Google ranks your site lower.
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