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    <title>安全 on 极客老墨</title>
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      <description>最近在维护一个老项目的时候，看到一段密码匹配的代码，感觉很奇怪，于是遍寻资料，最终还是很有收获。在密码学中,时序攻击是一种侧信道攻击,攻击者试图通过分析加密算法的时间执行来推导出密码。每一个逻辑运算在计算机需要时间来执行,根据输入不同,精确测量执行时间,根据执行时间反推出密码。</description>
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