Conditional privacy preserving security protocol for NFC applications

Recently, various mobile terminals equipped with NFC are released. However, The NFC security standard currently applied uses the user's public key constantly in the process of key agreement. Since it does not provide with unlinkability between user messages, privacy infringement may happen. This paper proposes a method provide a conditional anonymity using dynamic public key to solve this problem. Also it defines PDU for the conditional anonymity, so that the user can use the dynamic public key selectively. Through this, the user can protect privacy and can verify identity through a trusted authority if necessary.