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bitpat

2021-02-01 Markku-Juhani O. Saarinen mjos@pqshield.com

Supplementary material for the paper Saarinen, M.-J. (2021): "On Entropy and Bit Patterns of Ring Oscillator Jitter." available as arXiv:2102.02196.

The code is plain C99, requires just FFTW3:

sudo apt install libfftw3-dev

See bitpat.h for function definitions. Each function takes in (F, D, s2) ring oscillator model parameters. Some main functions:

  • pzfft.c: entropy_fft() computes bit pattern probabilities and Shannon / min-entropy from it.
  • autoc.c: ck_eval() computes the autocorrelation coefficients of Eqn. 6, for which eval_s1() computes the indefinite integral of Eqn. 12.
  • simul.c has functions entropy_sim() and ck_sim() which obtain distribution, entropy, and autocorrelation estimates via (much slower) Monte Carlo simulation.

There's a stub main.c that prints calculated and simulated autocorrelated vectors for some parameters, and then does the same for bit pattern distributions and entropy.

Cheers,

  • markku