Sécurité et certificats
Vérificateur de certificat SSL en ligne
Analysez un certificat SSL/TLS, sa validité, ses dates, son émetteur et ses domaines couverts.
Guide SSL/TLS
Qu'est-ce qu'un certificat SSL/TLS ?
Un certificat SSL/TLS permet d'établir des connexions HTTPS chiffrées et aide à vérifier l'identité du serveur.
Que vérifie cet outil ?
Il vérifie la connexion TLS, les dates de validité, le nom d'hôte, l'émetteur, les noms alternatifs et l'empreinte du certificat.
Que sont les SAN ?
Les Subject Alternative Names indiquent les domaines et sous-domaines couverts par un même certificat.
Questions fréquentes
Questions fréquentes sur les certificats SSL
How do I check an SSL certificate?
Enter the domain, keep port 443 and select Check SSL.
When does my SSL certificate expire?
The result shows the expiration date and remaining days.
How do I know if a certificate covers my domain?
The tool compares the hostname with the CN and Subject Alternative Names.
What does self-signed certificate mean?
It means the certificate is signed by itself rather than a recognised trusted authority.
What is a wildcard certificate?
A wildcard such as *.example.com covers one subdomain level, not every nested level.
What are Subject Alternative Names?
They are additional names included in a certificate for other valid domains.
What happens when a certificate expires?
Browsers may show warnings and the connection is no longer considered trusted.
What is the difference between SSL and TLS?
TLS is the modern protocol that replaced SSL, although SSL remains a common term.