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      <title>密码哈希算法对比：MD5、SHA-1、SHA-256、bcrypt</title>
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      <description>对比常用哈希算法的特点和适用场景，解释为什么存储密码要用 bcrypt 而不是 SHA-256。</description>
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      <title>SHA-256 哈希算法原理</title>
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      <description>深入解析 SHA-256 哈希算法的工作原理，包括消息填充、分块处理、压缩函数等核心步骤，理解其安全性的数学基础。</description>
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