Method subtract

src/main/java/com/thealgorithms/ciphers/ECC.java:213–216

Subtract two points on the elliptic curve.

(ECPoint other, BigInteger p, BigInteger a)

         * Subtract two points on the elliptic curve.
         */
        public ECPoint subtract(ECPoint other, BigInteger p, BigInteger a) {
            ECPoint negOther = new ECPoint(other.x, p.subtract(other.y)); // Negate the Y coordinate
            return this.add(negOther, p, a); // Add the negated point
        }

        /**
         * Multiply a point by a scalar (repeated addition).