Nitrokey[1] is about the same price as Yubico but has <i>open source firmware &amp; hardware</i>. You might also know them as CryptoStick[2].<p>[1] <a href="https:&#x2F;&#x2F;www.nitrokey.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.nitrokey.com&#x2F;</a><p>[2] <a href="https:&#x2F;&#x2F;blog.mozilla.org&#x2F;security&#x2F;2013&#x2F;02&#x2F;13&#x2F;using-cryptostick-as-an-hsm&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.mozilla.org&#x2F;security&#x2F;2013&#x2F;02&#x2F;13&#x2F;using-cryptosti...</a>