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In the early days, public Wi-Fi networks often resembled the Wild West, where ARP spoofing attacks that allowed renegade users to read other users' traffic were common. The solution was to build cryptographic protections that prevented nearby parties—whether an authorized user on the network or someone near the AP (access point)—from reading or tampering with the traffic of any other user.
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1970年代后，Sun City的居民逐渐高龄化，单纯的基础医疗已经不够用。于是医院开始拓展服务范围，新增癌症护理、康复、神经科等专科，还引入家庭护理、预防保健等辅助服务，贴合老人的长期护理需求。