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协变和逆变，是为解决问题而生的。而要理清解决什么样的问题，需要首先从理清几个简单的概念开始。首先我们进行一点操作：
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你的隐私选择 主题 亮 暗 高对比度
你的隐私选择 主题 亮 暗 高对比度
你的隐私选择 主题 亮 暗 高对比度
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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。