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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But at such a busy time of year for hospitals and GP surgeries, appointments and operations are likely to be disrupted for thousands of patients.，更多细节参见91视频
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