SEO Tools

SSL Lookup

Check SSL/TLS certificate validity, expiration dates, issuing authority, and cryptographic signature strength.

Validité Certificat Dates d'expiration Autorité (CA) Algorithme de Chiffrement

Complete SSL/TLS Certificate & HTTPS Security Guide

Master web encryption, Certificate Authority chains, and vital SEO security ranking factors.

Transport Layer Security (TLS) and SSL safeguard online communications by creating an encrypted tunnel between web browsers and servers. Combining asymmetric cryptography (RSA / ECC) for handshake key exchanges and symmetric 256-bit encryption (AES-GCM), HTTPS ensures sensitive credentials and transactional data remain completely protected from eavesdropping and tampering.

Levels

Validation Tiers

DV (Domain): Automated ownership validation.
OV (Organization) & EV (Extended): Thorough legal entity validation for top brand authority.

Trust

Chain of Trust

Valid certificates chain up to trusted Root CAs pre-installed in operating systems (Let's Encrypt, DigiCert, Cloudflare).

Cipher

TLS 1.3 & PFS

TLS 1.3 cuts handshake time to a single round-trip (1-RTT) while mandating Perfect Forward Secrecy for past session protection.

Speed

OCSP Stapling

Servers deliver timestamped certificate revocation proofs directly to browsers, avoiding external CA latency.

SSL/TLS Audit Checklist for Webmasters & SEO Specialists

  • Systematic 301 Redirect: Redirect http:// to https:// to prevent duplicate content and consolidate SEO domain authority.
  • Zero Mixed Content: No scripts, stylesheets, or images should be loaded over insecure http://, which disables the security padlock in modern browsers.
  • HSTS Security Header: Implement Strict-Transport-Security: max-age=31536000; includeSubDomains; preload to force browsers to always connect via HTTPS.
  • Proactive Expiration Monitoring: Set up automated renewal alerts at least 30 days prior to certificate expiration to prevent catastrophic downtime.

Questions Fréquemment Posées (FAQ)

Tout ce que vous devez savoir pour exploiter au mieux cet outil.

Checking SSL certificates ensures valid encryption, prevents unexpected expiration, and protects visitors from security warnings.

Web browsers will block access with security warnings, resulting in massive organic traffic and trust loss.

A CA is a trusted entity (such as Let's Encrypt, DigiCert, or Cloudflare) that validates domain ownership and signs the certificate.

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