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Terme informatique

SSL/TLS Certificate

A digital certificate that associates a domain name or identity with a public key.

Cybersecurity
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Simple definition

The certificate allows the browser to verify the identity of the site and to establish a connection HTTPS Numbered.

Technical definition

It is signed by a certification authority and includes the subject, the names covered, the public key and a period of validity. TLS then uses this key in the establishment of the secure session.

What is it used for ?

Secure websites, messaging services, VPN, LDAP and internal applications.

Practical example

The browser accepts the certificate of boiteaoutilsinformatique.fr Because his name matches and his chain goes back to a recognized authority.

Common issues

  • Certificate expired
  • Domain name not covered
  • Incomplete intermediate chain
  • Self-signed certificate not approved

HTTPS · Encryption · LDAP · SMTP · DNS

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

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