EC Cryptography Tutorials - Herong's Tutorial Examples - Version 1.00, by Dr. Herong Yang
Subtraction Operation on an Elliptic Curve
This section describes the Subtraction operation on an elliptic curve. If the resulting point of the subtraction operation of point Q from P, then P - R = P + (-Q)..
With the introduction of the negation operation, we can easily define the subtraction operation on an elliptic curve as the following.
If we use the minus sign "-" as the negation operator, then the resulting point R of the subtraction operation of a point Q from P on an elliptic curve can be expressed as the following:
R = P - Q = P + (-P), where (-Q) is the negation operation of Q
Last update: 2019.
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