SRAM-based fingerprinting uses deviations in power-up behaviour caused by the CMOS fabrication process to identify distinct\r\ndevices. This method is a promising technique for unique identification of physical devices. In the case of SRAM-based hardware\r\nreconfigurable devices such as FPGAs, the integrated SRAM cells are often initialized automatically at power-up, sweeping potential\r\nidentification data. We demonstrate an approach to utilize unused parts of configuration memory space for device identification.\r\nBased on a total of over 200,000 measurements on nine Xilinx Virtex-5 FPGAs, we show that the retrieved values have promising\r\nproperties with respect to consistency on one device, variety between different devices, and stability considering temperature\r\nvariation and aging.
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