What is certificate-based authentication?

Certificate-based authentication is a method of verifying the identity of a user, device, or service by using digital certificates. Instead of relying solely on usernames and passwords, it uses cryptographic keys embedded within digital certificates to confirm the authenticity of the entity requesting access. This involves a trusted Certificate Authority (CA) issuing certificates that bind a public key to a specific identity. When authenticating, the entity presents its certificate, which is then verified against the CA's public key, confirming the identity and allowing access to the requested resource. It's commonly used for secure access to networks, websites, and applications, as well as for digitally signing documents and emails.