The VivoKey is an NFC-only device designed to cover the bulk of use cases of the YubiKey while also having space for general user-supplied applications such as transit pass emulation via the Fidesmo platform. It is Paralyne-C coated and on a flexible PCB intended for implantation and is currently in human trials.

For people who are not as into scalpels, it would of course be possible to insert such a device into a watch band or bracelet.

  • 100% of application code is public and auditable
  • Applications can be updated
  • Very unlikely to be lost
  • Hardware design and JavaCard OS not available for public auditing.
  • Does not support physical touch allowing a remote attacker unlimited uses
  • Entropy source is controlled entirely by NXP