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a, b

Note: ECC


  ECC domain parameters; two elements in the finite field GF(q) that define the equation of an elliptic curve, y2 = x3 + ax + b when q is a prime or y2 + xy = x3 + ax2 + b, when q = 2m for an integer m.
NIST SP 800-56A Rev. 2 [Superseded]