The best security keys of 2023: Expert tested


Nitrokey 3A NFC features: Open source technologies | Based on Rust | Hardware security includes Secure Boot and ARM TrustZone | Supports multiple operating systems | Firmware updates | Supports FIDO U2F, FIDO2, WebAuthn, OTP, and more 

Developed in the Rust language, the Nitrokey 3A NFC security key is based on open source technologies. The key’s cryptographic framework and protocols, Trussed, are available for the public to view and examine. 

Nitrokey can handle authentication protocols, including WebAuthn, FIDO U2F, FIDO2, one-time passwords, and time-based one-time passwords. Keep in mind, however, that not all functions are available straight out of the box — you may need to spend some time updating the device.

The key’s microprocessor has security features, including Secure Boot and ARM TrustZone. The Windows, macOS, Linux, BSD, Android, and iOS operating systems are supported via USB-A.

If you’re willing to wait, a next-generation key is also available on pre-order.

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