Commit f6dacc26 authored by Jakob Botsch Nielsen's avatar Jakob Botsch Nielsen

Add secret key zero knowledge check to boardroom voting

* Implement the secret key zero knowledge check described in the
  original open vote network paper.
* Change BigZ.boardroom_axioms to only use BigZ for inner computation
* Remove unneeded BignumsSerializable, which is not necessary due to the
  switch above.
parent a7836c1c
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