privacytools.io/_includes/sections/security-keys.html

<h1 id="u2f" class="anchor"><a href="#u2f"><i class="fas fa-link anchor-icon"></i></a> U2F Security Keys</h1>

{% include cardv2.html
title="SoloKeys"
image="/assets/img/png/3rd-party/solokey.png"
description='The SoloKey is the "first open-source FIDO2 security key", available in both USB-A and USB-C variants with optional NFC capability for mobile devices. It is less feature-rich compared to the YubiKey 5 lineup, but at $20 it is a great starting point for securing your accounts, or backup U2F authenticator.'
website="https://solokeys.com/"
github="https://github.com/solokeys"
%}

{% include cardv2.html
title="YubiKey 5"
badges="info:Upgrade Pick"
image="/assets/img/png/3rd-party/yubikey-5c.png"
description='The YubiKey 5 is a multi-protocol security key, providing strong two-factor, multi-factor and passwordless authentication, and seamless touch-to-sign. It supports FIDO2, FIDO U2F, one-time password (OTP), and OpenPGP smart card functionality. It is available in a variety of form factors for desktop or laptop.'
website="https://www.yubico.com/products/yubikey-5-overview/"
github="https://github.com/yubico"
%}

<h3>Worth Mentioning</h3>

<ul>
  <li><a href="https://www.nitrokey.com/">Nitrokey</a> - A variety of security key products for different workloads. All Nitrokey products are open-source and customizable. The <a href="https://www.nitrokey.com/sites/default/files/NitrokeyFirmwareSecurityAuditReport05-2015.pdf">firmware</a> and <a href="https://www.nitrokey.com/sites/default/files/NitrokeyHardwareSecurityAuditReport08-2015.pdf">hardware</a> have been independently assessed by Cure53 in 2015. We have found that there is no best overall product (the <em>Pro 2</em> lacks Curve25519 while the lower-end <em>Start</em> supports it, for example) and they are lacking a variety of form factors such as USB-C and NFC that would be more convenient for many users.</li>
</ul>