A certificate authority is an attachment to an e-mail message or data embedded in a website that verifies the identity of a sender or a website.

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A certificate authority (CA) is not an attachment or data embedded in a website. It is a trusted third-party organization that issues digital certificates used to verify the identity of individuals, organizations, and websites online. The digital certificate includes information about the certificate holder, such as their name, public key, and the digital signature of the CA to validate its authenticity.

A Certificate Authority Is an Attachment to an E-Mail Message