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为了提高其效率，提出了一种高阶差分正演模拟方法。
A high order finite difference forward modelling method was proposed to improve its efficiency.
高阶差分加上合适的边界条件能较好地解决网格频散和边界效应问题。
When a suitable boundary condition is given, this method can solve the problems of the numerical dispersion and boundary effectiveness.
使用高阶差分状态序列，增强了系统因果强度，加强了抵抗身份欺骗和差分分析攻击的能力。
By using the high order differential state sequence, the casuality of the system and the capability of resistance to identity deception and differential attacks is enhanced.
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