Initial commit - 611 cybersecurity skills across all subdomains

skills/configuring-multi-factor-authentication-with-duo/references/standards.md

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+# Standards and References - MFA with Duo
+
+## NIST Standards
+- **NIST SP 800-63B**: Digital Identity Guidelines - Authentication and Lifecycle Management
+  - AAL1: Single-factor authentication
+  - AAL2: Multi-factor authentication (Duo Push, TOTP)
+  - AAL3: Hardware-based phishing-resistant (FIDO2, PIV)
+- **NIST SP 800-53 Rev 5**: IA-2, IA-2(1), IA-2(2), IA-2(6), IA-2(8), IA-3, IA-5
+
+## Duo Documentation
+- **Duo Authentication Proxy**: https://duo.com/docs/authproxy-reference
+- **Duo for RDP**: https://duo.com/docs/rdp
+- **Duo Unix (SSH)**: https://duo.com/docs/duounix
+- **Duo Web SDK**: https://duo.com/docs/duoweb
+- **Duo Verified Push**: https://duo.com/blog/webauthn-passwordless-fido2-explained-componens-passwordless-architecture
+- **Duo Admin API**: https://duo.com/docs/adminapi
+
+## CISA Guidance
+- **CISA MFA Guidance**: Phishing-resistant MFA requirement for federal agencies
+- **EO 14028**: Executive Order on Improving the Nation's Cybersecurity - MFA mandate
+
+## Compliance
+- **PCI DSS 4.0**: Requirement 8.3.1 - MFA for all access to CDE
+- **HIPAA**: 45 CFR 164.312(d) - Person or entity authentication
+- **SOX**: MFA for privileged financial system access
+- **CMMC**: Level 2 - IA.L2-3.5.3 Multi-factor authentication