ePass A4B USB-A

Feitian ePass FIDO A4B – The compact USB-A Security Key for FIDO2, FIDO U2F, and OTP authentication

Secure authentication doesn’t have to be expensive or complicated. The Feitian ePass FIDO A4B is a cost-effective yet powerful solution for businesses and individuals who want to reliably secure their online accounts and business applications. As a FIDO2- and FIDO U2F-certified USB-A Security Key with additional HOTP/TOTP support, it offers excellent Value for Money for Large-Scale Enterprise Deployment.

FIDO2, FIDO U2F, and OTP—three protocols in one key

The A4B supports FIDO2 for passwordless authentication, FIDO U2F for Two-Factor Authentication of existing accounts, as well as HOTP and TOTP for legacy systems and applications that do not yet support FIDO. This means a single key covers all common authentication scenarios—without requiring users or IT departments to perform device Management. Additionally, GIDS (Generic Identity Device Specification) is supported, enabling integration into Windows PKI environments.

Smart Card Secure Element – No Driver, No Installation

Inside the A4B is a smart card secure element based on SHA-256 and ECDSA on P-256. The key is recognized asa standard HID device —no driver or software installation is required on the client device. Simply plug it in, enter your PIN or press a button, and log in securely. Compatible with Windows, macOS, and Linux.

Protection against phishing and man-in-the-middle attacks

The FIDO protocol is based on asymmetric cryptography with site-specific keys: Secrets are not shared between different services, which effectively prevents phishing and man-in-the-middle attacks. The unlimited number of accounts that can be registered makes the A4B the ideal solution for users who want to secure multiple online services at the same time.

Compact, rugged design for everyday use

The A4B is about the size of a key and can be easily attached to a keychain. The injection-molded housing provides good protection against physical impacts. A green LED and a push button allow for easy status indication and user interaction. Operating temperature: –10 °C to +60 °C; data retention: 10 years. Compatible with Gmail, Facebook, Dropbox, GitHub, Microsoft Azure Entra ID, OKTA, Ping Identity, Salesforce, DUO Security, Bank of America, Coinbase, and hundreds of other FIDO-compatible services.

Who is the Feitian A4B suitable for?

Companies of all sizes looking for a cost-effective, FIDO2-certified 2FA solution for large user groups—as well as individuals who want to secure their most important online accounts with a single, trusted USB-A key.