适合大学二年级学生的暑期项目（最好是开源项目）
我是一名大学二年级学生的家长。我的儿子在美国学习数据科学。他对计算机算法和计算机安全很感兴趣，并且愿意进行编码或以其他方式贡献。请建议一些有意义的项目（最好是开源项目），他可以在暑假期间进行，大约可以投入120个小时。
我在这里询问是因为他希望项目的形式是半正式的（不期望有报酬，他只想寻求乐趣和挑战），同时这里的人们非常有知识。
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I am the parent of a college sophomore. My son is learning data science in the US. He likes computer algorithms and computer security and is willing to code or contribute otherwise. Please suggest meaningful projects (preferably open source) to do over the summer. He can work on them for about 120 hours.<p>I ask here because he'd like the form of project to be semi-formal (no remuneration is expected, only fun and challenge are what he's looking for) and also because people here are very knowledgeable.