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    <title>PGP on 知识铺的博客</title>
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      <title>1999年论文揭示PGP 5.0可用性困境</title>
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      <description>论文标题揭示的加密可用性困境 1999年发表的论文标题《Why Johnny Can&amp;rsquo;t Encrypt: A Usability Evaluation of PGP 5.0》直接点明普通用户与加密工具之间的脱节。标题中的“Johnny”代表典型非专业用户，而PGP 5.0则是当时流行的加密软件。该表述强调可用性评估的核心发现：即使动机良好，用户也难以正确使用加密工具。 这</description>
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