SurePassID is an advanced, deploy-anywhere multi-factor authentication platform built to secure both IT and OT (operational technology) environments, including critical infrastructure, legacy systems, on-premise, air-gapped, hybrid cloud, or fully cloud-based operations. It supports a wide variety of authentication methods; passwordless, phishing-resistant approaches like FIDO2/WebAuthn (with FIDO2 PIN, biometric, or push), as well as one-time passwords (OTP via OATH HOTP/TOTP), mobile push, SMS, voice, and traditional methods. SurePassID integrates with common operating systems, including domain and local logins, RDP/SSH remote access, and even legacy or embedded Windows systems often found in OT/ICS/SCADA environments, enabling offline 2FA when needed. It also supports securing VPNs, network devices, appliances, legacy applications, web apps (via SAML 2.0 or OIDC identity provider functionality), and network-device access protocols.