SSL / TLS Certificate & Security Inspector
Inspect SSL certificates, calculate remaining validity days, analyze Subject Alternative Names (SAN), verify Certificate Authority (CA) issuers, and evaluate transport encryption posture.
Valid SSL / TLS Active
Certificate trusted • Modern Perfect Forward Secrecy
Subject Alternative Names (SAN)
Best Practices for Web PKI & TLS Hardening
Transport Layer Security (TLS) is the cornerstone of modern web privacy, preventing eavesdropping and tampering with user sessions. Modern security baselines require:
1. Transitioning to TLS 1.3 Exclusively
TLS 1.3 eliminates obsolete, vulnerable cryptographic algorithms (such as RSA key exchange without forward secrecy, RC4, and 3DES) and reduces the TLS handshake to a single round-trip (1-RTT), significantly improving mobile page load speeds and Google Core Web Vitals.
2. Automated Renewal & Monitoring Expiring Certificates
Google and Apple have proposed shortening maximum SSL certificate validity to 45–90 days. Manual renewals are no longer viable. Cloud providers (like Firebase Hosting, Cloudflare, and AWS CloudFront) automate zero-downtime certificate rotation using ACME protocols.
3. Enforcing HSTS (HTTP Strict Transport Security)
Having an SSL certificate is insufficient if your server allows unencrypted HTTP connections. The Strict-Transport-Security header forces web browsers to communicate exclusively over HTTPS, mitigating SSL stripping attacks.