[Home](./index.md) > [@digitalpersona/authentication](./authentication.md) > [U2FAuth](./authentication.u2fauth.md) ## U2FAuth class Universal Second Factor (U2F) authentication API. U2F support only authentication. Identification is not supported. Signature: ```typescript export declare class U2FAuth extends Authenticator ``` ## Constructors | Constructor | Modifiers | Description | | --- | --- | --- | | [(constructor)(authService)](./authentication.u2fauth.(constructor).md) | | Constructs a new U2F authentication API object. | ## Methods | Method | Modifiers | Description | | --- | --- | --- | | [authenticate(identity)](./authentication.u2fauth.authenticate.md) | | Authenticates the user using a user's registered U2F token (FIDO token). | | [getAppId()](./authentication.u2fauth.getappid.md) | | Reads U2F AppID endpoint URL. | | [isSupported()](./authentication.u2fauth.issupported.md) | static | Checks is the U2F supported on this platform. |