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注意：加密文件之后如果忘记了用来加密该文件的密码，再想恢复出原始文件就不可能了。当然，这与密码本身的复杂程度有关，要想保证文件的安全，最好采用较复杂的密码，例如混合运用字母、数字和特殊字符（如“$”符号等）。
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跨编程域 （云、客户端、游戏）的适应性通过常规用途编程模型的专用实现启用。
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The Redo option is simply obtainable after you undo an motion so that you can restore the action you final undid.
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针对泄密的最佳防范措施就是加密。有效的加密不仅杜绝了泄密，而且还防范了由泄密引发的攻击。加密技术有时还用于通信过程中的身份验证——如果某个用户知道密码，那么他应该就是那个拥有这一身份的人。
C# 面向对象，运行时支持对象方向。 C# 需要垃圾回收，运行时提供跟踪垃圾回收器。 库（以及应用堆栈）将这些功能塑造成概念和对象模型，使开发人员能够在直观的工作流中高效编写算法。
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而这种原始转换（由子类转换为父类）方向相同的可变性，被称为协变（covariant）；其反向操作则被称为逆变（contravariant）。当同样的情形应用于泛型时，例如：
黑客和密码专家破解加密文件的办法主要有两个，第一是搜索密文是否有重复现象，第二是用暴力破解法获得密钥。首先我们考虑一下初始向量如何防止重复现象，然后再探讨一下防止暴力破解的关键问题。