A digital certificate, which is also referred to as a public key certificate or an identity certificate, is simply an electronic document that uses a digital signature to connect a public key to an identity like the name of a person or corporation and other information. The information that is on a digital certificate includes a unique serial number, a subject, an algorithm used to generate a signature, the name of the issuer of the certificate, the valid dates including the expiration, the public key and more. Digital certificates are commonly used on HTTP Secure websites.
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