1Introduction
NFC stands for Near Field Communication. The specification details of NFC can be found in ISO 18092 [1]. The main characteristic of NFC is that it is a wireless communication interface with a working distance limited to about 10 cm. The interface can operate in several modes. The modes are distinguished whether a device creates its own RF field or whether a device retrieves the power from the RF field generated by another device. If the device generates its own field it is called an active device, otherwise it is called a passive device. Active devices usually have a power supply, passive devices usually don't (e.g. contactless Smart Card). When two devices communicate three different configurations are possible. These are described in Table