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Exercises in Privacy Enhancing Technologies (UCL Information Security MSc; Course COMPGA17)
The code was:
if x == None and y == None:
return True
And should be:
if x is None and y is None:
return True
Hello, I would like to ask about the reasoning for having
a
and b
in the function's prototype, when the formula for calculating the sum of two points does not require them (it only needs the coordinates of both points and p
). Is this to perform a sanity check and verify whether the points are on the curve before attempting to add them?
p
is required, according to the formula in the function's docstring, and hence the function expects this parameter as well. However, if I look into various sources that explain how this works (e.g. https://en.wikipedia.org/wiki/Elliptic_curve_point_multiplication#Point_addition) then there is no mod p
component there. Why is it required here?
This is the function I refer to: https://github.com/gdanezis/PET-Exercises/blob/master/Lab01Basics/Lab01Code.py#L91
in 5th function in task3
point_scalar_multiplication_montgomerry_ladder
the comment about algorithm's for loop has a issue.
for di in num_bits(P)-1 to zero:
di should be i.
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