SecureW2 Passwordless Desktop Authentication replaces traditional password-based desktop login with certificate-based authentication. The solution issues certificates tied to both users and endpoints, validating identity and device trust during login without requiring passwords. The product supports Windows, macOS, Ubuntu, and Linux desktop authentication without requiring Active Directory domain controllers. It integrates with cloud identity providers to validate user identity and mobile device management systems to enforce device compliance policies before certificate issuance. Certificate validation uses EAP-TLS authentication protocol and supports hardware tokens including YubiKeys, smart cards, and PIV-compatible devices. Certificates are stored in hardware-backed security modules such as TPM, Keychain, or PKCS#11. The system performs real-time device compliance checks before granting access, blocking non-compliant devices from login. When users are disabled in connected identity providers, certificates can be revoked with enforcement timing dependent on login flow and operating system policies. Authentication events are logged with identity, device, and policy context for compliance and incident response purposes. The solution includes offline grace period support, allowing cached certificate validation for up to 7 days without network connectivity. The platform uses Dynamic SCEP and ACME Device Attestation protocols for certificate issuance and supports policy-based access enforcement with adaptive controls based on device posture and identity provider signals.