YubiChallenge is an Android app that provides a simple, low-level interface for performing challenge-response authentication using the NFC interface of a Yubikey Neo. This app should be triggered using an implicit intent by any external application wishing to perform challenge-response. The intent name should be "com.yubichallenge.NFCActivity.CHALLENGE" and the challenge should be stored in an extra called "challenge". The response will be returned by the intent in an extra called "response".
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