P-384 is the elliptic curve currently specified in Commercial National Security Algorithm Suite for the ECDSA and ECDH algorithms. It is a 384-bit curve over a finite field of prime order approximately 394×10113.[a] Its binary representation has 384 bits, with a simple pattern.[b] The curve is given by the equation y2 = x3 − 3x + b, where b is given by a certain 384-bit number. The curve has order less than the field size.[c] The bit-length of a key is considered to be that of the order of the curve, which is also 384 bits.
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