BIO-key FIDO-key security keys by BIO-key are compatible with the FIDO2 and WebAuthN standards for secure online authentication. These keys feature plug-and-play technology and work with major platforms including Microsoft Windows, macOS, and Linux. All tokens store an infinite number of cryptographic keys and are durable and waterproof. With BIO-key FIDO-key security keys, customers have cost-effective options for online authentication. All FIDO-keys can be used as supported multi-factor authentication (MFA) methods of BIO-key PortalGuard. BIO-key FIDO-key security keys can be used as a standalone authentication method.