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How does a digital certificate work?

Digital Certificates are based on Public Key Cryptography, a scheme that uses public and private key pairs. The certificate owner is assumed to be the only entity to be able to know or use the private signing key.
The public key is widely known and is used to verify the digital signature. A public and private key pair has no inherent association with any identity; it is simply a pair of numbers. This association is achieved in a Digital Certificate that binds the public key to an identity.

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