[Show abstract][Hide abstract] ABSTRACT: This paper presents a practical implementation of a digital baseband for a low-cost UHF Radio Frequency Identification (RFID) tag, in which a cryptography engine based on International Data Encryption Algorithm (IDEA) primitive is embedded. A mutual authentication scheme enforced by the IDEA engine is proposed. The scheme can improve the security of the ISO 18000-6C protocol and meet the timing constraints of the protocol as well. The whole security-enhanced tag, including digital baseband, RF/analog frontend and memory, has been taped out using SMIC 0.18μm CMOS process. The overall power consumption of the baseband system is 8.96μW when the supply voltage is 1.2V and the clock frequency is 1.28MHz. The tag works at the back linked frequency (BLF) of 80 KHz.
[Show abstract][Hide abstract] ABSTRACT: Radio frequency identification (RFID) is a technology for automatic object identification. It has wide applications in many areas such as manufacturing, transportation, healthcare, and so on. However, many RFID systems are suffering from security issues. In this paper, we present an implementation of a secure UHF RFID tag baseband with a Hummingbird (HB) cryptographic engine using the SMIC 0.13µm technology. An improvement of the Gen2 protocol based on our secure engine is proposed to enhance security. The implementation results show that the area of our baseband is 16,986 gate equivalents and the secure engine takes 23.6% of the entire die area. The overall power consumption of our baseband is 30.67µW at a clock frequency of 1.28MHz and with 1.2V power supply, which is suitable for resource-constrained RFID tags.