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Verification of an entity’s identity.

Definition

Authentication is the process of verifying an asserted identity using one or more factors (knowledge, possession, inherence) and an authentication protocol.

In plain English Verification of an entity’s identity.

Why this matters

Why it matters: Weak authentication increases the likelihood of unauthorized access, account takeover, and data exposure.

Example

Example: Password-based authentication augmented with MFA using a possession factor.