The vivokey has a secure element: you can keep RSA keys on it and use it like a yubikey. Notably, it's the first NFC 4096 bit capable device I've seen (Yubikey

The vivokey has a secure element: you can keep RSA keys on it and use it like a yubikey. Notably, it's the first NFC 4096 bit capable device I've seen (Yubikey Neo is max 2048bit; Yubikey 4 doesn't have NFC).