Adds a second layer of security, such as a one-time password (OTP) or a push notification to a mobile device.

Using experts, appraisals, and carbon dating to verify origin and ownership history (provenance). 4. International Documentation How to Authenticate Email Domain Godaddy (Full 2025 Guide)

Using SPF, DKIM, and DMARC to prove an email came from a legitimate source, preventing spoofing.

To prevent unauthorized access, protect against identity theft, and secure data integrity. 2. Legal & Evidence Context

To authenticate means to prove that something—a user, a document, or a piece of evidence—is genuine, real, and not a forgery or a copy. It is the essential process of verifying the identity of a user, process, or device, usually as a prerequisite to allowing access to resources in an information system.

Simply showing a screenshot is often insufficient; original metadata (timestamps, file properties) is required. 3. Physical & Historical Authentication