This repository complements the research documented in the paper `Hitag 2 Hell - Brutally optimizing guess-and-determine attacks', as presented at USENIX WOOT2018.

• maskgen.py: generate masks for which bits to guess in each layer

• naive.py: naive guess-and-determine implementation

• unrolled.py: naive implementation which is unrolled

• tabled.py: implementation which avoids impossible guesses

• tabled_buffered.py: implementation which avoids impossible guesses, and tries to mitigate the intense cache pressure

• memoized.py: implementation which applies memoization

• generate_memoized_python.py: generator for memoized_gen.py

• memoized_gen.py: generated code from generate_memoized_python.py, used in memoized.py

• complexity.py: compute complexity at each layer

• hitag2.py: HITAG2 implementation

Our best implementations from the research, as featured in the paper's appendix verbatim, are also included here for ease of use.