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      <description>OpenSSL passwd 命令用于生成 Unix 密码哈希，支持 SHA-512、SHA-256、MD5 等算法，适用于系统管理和脚本场景。</description>
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      <title>OpenSSL 计算文件和字符串哈希值</title>
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      <description>使用 OpenSSL dgst 命令计算文件的 SHA-256、SHA-512、MD5 等哈希值，用于文件完整性校验和密码存储。</description>
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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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      <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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