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2.2.1 Permitted Authenticator Types

NIST PIV and digital identity SP 800-63B-4 against SP 800-63B
All changes in this version
added 2 Authentication Assurance Levels part of 2.2

Title changed

Before · SP 800-63B

After · SP 800-63B-4

Permitted Authenticator Types

Control changed

Before · SP 800-63B

After · SP 800-63B-4

At AAL2, authentication SHALL use either a multi-factor authenticator or a combination of two separate authentication factors. A multi-factor authenticator requires two factors to execute a single authentication event, such as a cryptographically secure device with an integrated biometric sensor that is required to activate the device. Authenticator requirements are specified in Sec. 3 .

When a multi-factor authenticator is used, any of the following MAY be used:

• Multi-factor out-of-band authenticator ( Sec. 3.1.3.4 )

• Multi-factor OTP ( Sec. 3.1.5 )

• Multi-factor cryptographic authentication ( Sec. 3.1.7 )

When a combination of two single-factor authenticators is used, the combination SHALL include one physical authenticator (i.e., “something you have”) from the following list in conjunction with either a password ( Sec. 3.1.1 ) or a biometric comparison:

• Look-up secret ( Sec. 3.1.2 )

• Out-of-band device ( Sec. 3.1.3 )

• Single-factor OTP ( Sec. 3.1.4 )

• Single-factor cryptographic authentication ( Sec. 3.1.6 ) A biometric characteristic is not recognized as an authenticator by itself. Section 3.2.3 requires a physical authenticator to be authenticated along with a biometric comparison. The physical authenticator then serves as “something you have,” while the biometric match serves as “something you are.” When a biometric comparison is used as an activation factor for a multi-factor authenticator, the authenticator itself serves as the physical authenticator. As noted in that section, local verification of biometric factors (i.e., the use of a multi-factor authenticator with a biometric comparison as an activation factor) is preferred over central biometric factor comparison.