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 参考：
 
+[Elliptic curves and their implementation (04 Dec 2010)](https://www.imperialviolet.org/2010/12/04/ecc.html)
+
 [Fast prime field elliptic-curve cryptography with 256-bit primes](https://link.springer.com/article/10.1007%2Fs13389-014-0090-x)
 
 [P-256 (secp256r1) Scalar Inversion](https://briansmith.org/ecc-inversion-addition-chains-01#p256_scalar_inversion)
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