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How Does the Curve Equation Define the Possible Points for the Key Pair?

The elliptic curve equation, such as y2 = x3 + ax + b (mod p), defines the set of all valid points (x, y) that lie on the curve over a finite field (p). All public keys and the generator point must satisfy this equation.

The private key is a scalar, but the public key is a point on the curve. The equation establishes the mathematical space in which all ECDSA operations take place, ensuring consistency and cryptographic properties.

What Is the ‘R’ Value in an ECDSA Signature and How Is It Derived from ‘K’?
What Mathematical Operation Is Equivalent to ‘Scalar Multiplication’ on an Elliptic Curve?
Why Must the Nonce (K) Be Unique and Secret for Every Signature?
What Is the ‘Base Point’ in the Context of Elliptic Curve Cryptography?