the elliptic curve的用法和樣例：
例句
- Implement a digital signature scheme based on elliptic curve cryptosystem.
實現了一種基於橢圓曲線密碼體制的數字簽名方案。 - At present, the Elliptic Curve Cryptography has the most secure private key when compared with other Public-Key Cryptography systems.
橢圓曲線密碼體制是目前公鑰密碼體制中在密鑰大小相當的情況下安全強度最高的一種密碼體制。
