And this is exactly the type of strawman that usually accompanies the &quot;conspiracy theory&quot; bashing. You&#x27;ve chosen the strongest-claiming narrative, which is easily knocked down.<p>The simplest scenario isn&#x27;t that YubiKey 4 went closed source to support a government backdoor. It&#x27;s that it&#x27;s entirely for business reasons as they&#x27;ve said. And then after a few years, a few more layers of middle management, a few interesting users, and a little more TLA focus, Yubikey 6 quietly gets subverted.<p>Tangentially - I was pretty close to buying a Yubikey Neo for its form factor, but it didn&#x27;t seem like I could modify&#x2F;reload the OpenPGP applet, and documentation was scant as to how configurable it was. I really want the thing to operate as <i>semi</i> trusted hardware - pass<i>phrase</i>, etc. Smartcard tech is nifty, but it seems like a non-hardened chip would be more worthwhile for the ability to iterate features&#x2F;UI.