The essential differences between drilling geologic design of horizontal well and vertical well are "data encryption principle" and "two-time design principle".
依据断块油藏的地质特征和开发阶段，优化水平井的地质设计和生产参数，是保证水平井开发效果的关键。
The encryption principle and index structure of encryption data are developed. The encryption processing of duplicate data and algorithm exposure are analyzed.
详细阐述了其加密原理和密文索引结构，对重复性数据的加密处理和算法抗攻击性进行了分析。
In some detail, the paper expounds the principle about simple power analysis (SPA) attacks against the general cryptography and a particular theory against data encryption standard (DES) algorithm.
详细地阐述了对通用密码系统实施简易功耗分析攻击(SPA)的理论基础和对DES算法攻击的特定理论，并提出了对SPA的改进算法。
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