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Banderwagon: clearing cofactors #378

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mratsim opened this issue May 8, 2024 · 0 comments
Open

Banderwagon: clearing cofactors #378

mratsim opened this issue May 8, 2024 · 0 comments
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help wanted 👥 Extra attention is needed testing 🛂 verkle trees 🌴

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@mratsim
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mratsim commented May 8, 2024 •
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The documentation is clear on clearing Bandersnatch cofactor: https://hackmd.io/@6iQDuIePQjyYBqDChYw_jg/BJBNcv9fq#Bandersnatch-Subgroup

However it is unclear if this also applies for Banderwagon.

Clearing cofactor is necessary for a generic test suites for endomorphism acceleration (see #298)

The alternatives are:

  • Repeatedly creating points and checking if (1-aX²)/p = 1 which is not ideally if probability is low as it will slow down CI.
  • Or scalar multiplying a generator point.
    This is somewhat self-defeating if what we want to test is scalar multiplication
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help wanted 👥 Extra attention is needed testing 🛂 verkle trees 🌴
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