Innovative ATMEGA8 Microcontroler Static Authentication Based on SRAM PUF
Pascal Urien · 2020
In this paper we demonstrate physical static & dynamic authentication for ATMEGA8 microcontrollers used in USB tokens. This authentication is based on SRAM PUF dealing with 5184 bits. We present an original SRAM PUF-Extractor based on software and hardware components, such as SRAM probe software and waveform generator for power supply. We highlight the influence of the supply voltage rising time on the content of SRAM cells used for PUF authentication. Finally we observe that the power supply signal may act as a physical challenge (8–10 bits entropy in our experiment) for SRAM PUF generation, which could be used for dynamic authentication.