NIST Special Publication 800-63 is an essential document that serves to define how organizations authenticate users. Its requirements, such as mandating an upgrade to IAL3 after account recovery, help protect against malicious actors.
The fourth version (SP 800-63-4) retains the three-part model while updating requirements to reflect modern identity technology. For instance, new standards now call for phishing-resistant methods like FIDO Passkeys in AALs and remote identity proofing at IAL2.
Benefits
NIST 800-63A IAL3 is an invaluable set of digital identity guidelines, outlining extensive proofing, strong phishing-resistant authentication and secure federated identity practices. Published in 2025, its latest update addresses evolving cybersecurity threats by encouraging multifactor authentication such as PIV/CAC cards as an antiphishing measure and strengthening cybersecurity, fraud reduction and user experience enhancement. Adherence to these guidelines should be seen as a strategic imperative ensuring stronger cybersecurity, reduced fraud risk and enhanced user experiences.
This framework redefines assurance by emphasizing modular components that assess each stage of identity lifecycle management, such as IAL (Identity Assurance Level). AAL and FAL provide successively stronger verification requirements.
TrustSwiftly provides a comprehensive identity proofing solution that meets IAL2 and IAL3 compliance, such as chat, video, facial recognition with liveness detection and document authentication – which all can effectively protect against social engineering attacks or impersonation tactics. By reducing their attack surface area and liability costs associated with employee claims. This helps businesses save both costs and operational expenses related to cyber liability insurance coverage and operational expenses.
Scalability
NIST 800-63-4’s fourth version maintains three identity assurance levels (IAL, AAL and FAL), yet adds requirements to address new threats such as highly scalable attacks against enrollment or synthetic identities. Furthermore, support for federated identity management allows one CSP to assert verified attributes to multiple parties that rely on them.
TrustSwiftly NIST IAL3 verification provides businesses with an invaluable advantage when it comes to verifying customers or employees. Using a camera, evidence documents, supervised remote IAL3 identity proofing or physical identity proofing and biometric protection features like facial recognition with liveness detection as well as fingerprint and voice biometrics against social engineering attempts are utilized by this platform for customer verification and employee screening purposes.
Hardware authenticators and verifiers that meet AAL3 security requirements and FIPS 140 validation are necessary as well. Microsoft Azure AD supports both FIDO2 security keys and smart cards as options.
Security
Digital identity standards such as NIST 800-63A IAL3 provide a comprehensive framework for assessing the trustworthiness of an individual’s online credentials. Their scalable architecture enables organizations to use both lightweight and strong authentication, and helps identify risks through different assurance levels (IdAL), AALs (AuthenticationAssuranceLaws), and FALs.
Zero Trust transforms compliance from an inflexible checkbox exercise into a self-sustaining security posture that uses continuous verification to assess contextual risk and adjust authentication requirements according to threat landscape, eliminating fraud while providing frictionless user experiences.
TrustSwiftly, our comprehensive IAL3 compliant solution, assists organizations in meeting IAL2 and IAL3 compliance by using chat, video, facial recognition with liveness detection, document authentication and step-up re-proofing based on risk. In addition, it includes hardware-backed authenticators which comply with these standards.
Cost
NIST 800-63A IAL3 is an influential document that governs how organizations verify and authenticate identities, but for people outside the identity industry it can be hard to grasp; its complex technical jargon often obscures important security measures or practical advantages it offers.
SP 800-63-4 maintains the three-tier model of Identity Assurance Levels (IAL), Authentication Assurance Levels (AAL), and Federation Assurance Levels (FAL), while expanding to meet requirements of modern identity technologies. Furthermore, this specification facilitates risk analysis and continuous verification processes.
TrustSwiftly ID Proofing Solution meets IAL2 and IAL3 compliance through chat, video, facial recognition with liveness detection, document authentication and step-up reproofing based on risk – helping reduce attack surface area while lowering cyber liability insurance premiums. This approach integrates business and security objectives, while offering customers a better customer experience. Furthermore, this strategy may also help companies reduce operational cost by decreasing reliance on costly in-person proofing – leading to reduced password resets, call center calls and reduced cyber liability insurance premiums as a result.
