在笛氏齐次坐标的基础上，采用齐次向量的方法，建立二维射影坐标系。
It is shown that the 2_dimensional projective coordinate system can be constructed by homogeneous vector on the basis of the Descartes homogeneous coordinates.
首次在射影坐标系下对亏格为3的超椭圆曲线密码体制推导了无需求逆的明确公式。
For the first time, the inversion-free explicit formulae are derived for genus 3 HECC in projective coordinate system.
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