SSL vs TLS Guide: Understanding the Protocols Behind HTTPS
The history from SSL to TLS 1.3, what changed in each version, why older versions are deprecated, and how to configure TLS securely.
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Tags: security, cryptography, tls
SSL vs TLS: What's the Difference and Why It Matters The terms "SSL certificate" and "TLS certificate" are used interchangeably in the industry, which causes confusion. SSL is actually dead — SSLv3 was deprecated in 2015 (RFC 7568) due to the POODLE attack, and SSLv2 before that. The certificates we use today are issued for TLS, not SSL. The terminology persists because of inertia. What matters operationally is which TLS version and which cipher suites your servers and clients negotiate. The Timeline: SSL → TLS As of 2021, TLS 1.0 and TLS 1.1 were formally deprecated. No browser or major server should accept them in new deployments. What "SSL Certificate" Actually Means An "SSL certificate" is an X.509 certificate used in TLS. The certificate itself has nothing SSL-specific about it. It…
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