NIST SP 800-63 provides digital identity guidelines to strengthen authentication and reduce risks of account takeover. It defines three Authenticator Assurance Levels (AALs) based on risk tolerance: AAL1 offers basic protection with single or multifactor options, AAL2 requires two distinct factors, and AAL3 provides the highest protection with cryptography and hardware-based authenticators. Organizations must align authentication choices with their security needs, considering vulnerabilities, rotation, and reauthentication requirements. CyberArk Identity Adaptive MFA supports a wide range of authenticators, simplifies AAL compliance, and integrates with SSO and lifecycle management to secure access across hybrid environments.

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