Variable-Length Bit Mapping and Error-Correcting Codes for Higher-Order Alphabet PUFs.
Vincent Immler, Matthias Hiller, Qinzhi Liu, Andreas Lenz, Antonia Wachter-Zeh · mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) · 2017
Device-specific physical characteristics provide the foundation for Physical Unclonable Functions (PUFs), a hardware primitive for secure storage of cryptographic keys. So far, they have been implemented by either directly evaluating a binary output or by mapping outputs from a higher-order alphabet to a fixed-length bit sequence. However, the latter causes a significant bias in the derived key when combined with an equidistant quantization.