Near Field Communication (NFC) is a promising short distance radio communication technology for many useful applications. Although its communication range is short, NFC alone does not guarantee secure communication and is subject to security attacks, such as eavesdropping attack. Generating a shared key and using symmetric key cryptography to secure the communication between NFC devices is a feasible solution to prevent various attacks. However, conventional Diffie-Hellman key agreement protocol is not preferable for resource constrained NFC devices due to its extensive computational overhead and energy consumption. In this paper, we propose a practical, fast and energy-efficient key agreement scheme, called RIWA (Random bIts transmission with Waveform shAking), for NFC devices by exploiting its full-duplex capability. In RIWA, two devices send random bits to each other simultaneously without strict synchronization or perfect match of amplitude and phase. On the contrary, RIWA randomly introduces synchronization offset and mismatch of amplitude and phase for each bit transmission in order to prevent a passive attacker from determining the generated key. A shared bit can be established when two devices send different bits. We conduct theoretical analysis on the correctness and security strength of RIWA, and extensive simulations to evaluate its effectiveness. We build a testbed based on USRP software defined radio and conduct proof-of-concept experiments to evaluate RIWA in a real-world environment. It shows that RIWA achieves a high key generation rate about 26kbps and is immune to eavesdropping attack even when the attacker is within several centimeters away from the legitimate devices. RIWA is a practical, fast, energy-efficient, and secure key agreement scheme for resource-constrained NFC devices.

Practical secret key agreement for full-duplex near field communications

Near Field Communication (NFC) is widely used today in many useful applications, such as contactless payment, identification, and file exchange. Due to the limitations on computation, power, and cost of NFC devices, NFC systems are often lack of encryption or weakly encrypted, leaving them exposed to security attacks. One solution for this problem is to install strong cryptographic protocols on NFC devices. However, it involves upgrading and revoking deployed NFC devices, which is costly and impractical. Moreover, encryption algorithms are usually considered expensive for resource constrained NFC devices in terms of computation overhead and energy consumption. In this paper, aiming at securing NFC from eavesdropping at physical layer, we propose SecNFC, a solution that changes the signals on the initiators to hide the communications, but does not require any changes to the targets. In this work, for the first time, we address a practical problem of synchronization offset between two NFC terminals, which can be exploited by an eavesdropper to compromise the transmitted bits. SecNFC takes into consideration the synchronization offset and solves the challenge by introducing blocking signals around the transition point when the target switches load between on and off. With this solution, even with the existence of synchronization offset, eavesdroppers cannot extract any bit information from eavesdropping. We conduct extensive simulations to evaluate the performance of SecNFC. We also build a testbed based on USRP software defined radio and off-the-shelf NFC tags to evaluate SecNFC in a real-world environment. Both simulation and experimental results show that SecNFC can efficiently prevent NFC from eavesdropping with a slight and tolerable decoding performance degradation at the initiator.

SecNFC: Securing inductively-coupled Near Field Communication at physical layer

This paper presents a fully integrated carrier clock recovery circuit for a mobile payment application. The architecture is based on a sampling-detection module and a charge pump phase locked loop.Compared with clock recovery in conventional 13.56 MHz transponders,this circuit can recover a high-precision consecutive carrier clock from the on/off keying(OOK) signal sent by interrogators.Fabricated by a SMIC 0.18-μm EEPROM CMOS process,this chip works from a single power supply as low as 1.5 V.Measurement results show that this circuit provides 0.34%frequency deviation and 8 mV sensitivity.

High-precision high-sensitivity clock recovery circuit for a mobile payment application

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High-precision high-sensitivity clock recovery circuit for a mobile payment application