Something the user knows: Certain knowledge only known to the user, such as a password, PIN, etc.

Something the user has: Any physical object in the possession of the user, such as a security token ( USB stick), a bank card, a key, etc.The authentication factors of a multi-factor authentication scheme may include: If, in an authentication attempt, at least one of the components is missing or supplied incorrectly, the user's identity is not established with sufficient certainty and access to the asset (e.g., a building, or data) being protected by multi-factor authentication then remains blocked.

The use of multiple authentication factors to prove one's identity is based on the premise that an unauthorized actor is unlikely to be able to supply the factors required for access. For additional security, the resource may require more than one factor-multi-factor authentication, or two-factor authentication in cases where exactly two pieces of evidence are to be supplied. Simple authentication requires only one such piece of evidence (factor), typically a password. The resource requires the user to supply the identity by which the user is known to the resource, along with evidence of the authenticity of the user's claim to that identity.

Security information and event management (SIEM)Īuthentication takes place when someone tries to log into a computer resource (such as a network, device, or application).Host-based intrusion detection system (HIDS).

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