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D.12.2.29 countPoints

Procedure from library crypto.lib (see crypto_lib).

Usage:
countPoints(N,a,b);

Return:
the number of points of the elliptic curve defined by y^2=x^3+a*x+b over Z/N

Note:
trivial approach

Example:
 
LIB "crypto.lib";
countPoints(181,71,150);
==> 198

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