ULRAS: Ultra-Lightweight RFID Authentication Scheme for Mobile Device

RFID is widely used on mobile devices and makes it possible to take advantage of RFID system to complete mobile payment or merchandise information reading. However, the widespread use of RFID tags brings the possibility for various security risks and privacy problems. In addition, the storage space, processing capability and power supply of RFID tags are limited. In this paper, in order to reduce the computational cost we present an ultra-lightweight RFID authentication scheme, named ULRAS. ULRAS only uses Bit and XOR operations to prevent the DDOS attack. ULRAS uses sub-key and sub-index number into its key update process to achieve the forward security. Compared to the SASI protocol and the Gossamer protocol, ULRAS cost less computation and communication resources and have stronger security.