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What is Certificate based Authentication?

Certificate-based authentication is a secure authentication method that uses digital certificates to verify the identity of a user, device, or server.

In this method, a digital certificate—issued by a trusted Certificate Authority (CA)—serves as a unique identifier, containing a public key, details about the certificate holder, and the CA’s digital signature.

When a user or device attempts to access a resource, the certificate is presented, and the server verifies it against a trusted CA list. If validated, it confirms the user's identity without requiring a password, relying instead on cryptographic keys for high security. This method is popular in secure environments like VPNs, corporate networks, and applications needing strong identity verification.

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