I don't quite understand NFC, so want to ask you a great god, if I have a read/write NFC tag card, myself to write some data, if there is another person take a NFC charge device (or mobile phone flash program) close to the card if I can put my this NFC tag card within the content has been deleted?

Is there a kind of authentication mechanism, is to give the NFC add password, only after the password authentication through flash? Please advise