YubiChallenge

YubiChallenge provides a simple interface for using the NFC challenge-response functionality built into a Yubikey Neo. Note that this app doesn't do anything on its own! It will be started by a 3rd party app such as keepass2android when necessary. It exists as a standalone app so that the majority of users who do not own a Yubikey do not have to grant NFC permissions unnecessarily and to provide a convenient interface for to this functionality for other developers.