iOS somewhat immune to WPA2 KRACK

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DelJo63

Apple's iOS devices (and Windows machines) are not as vulnerable as Macs or devices running Linux or Android because the vulnerability relies on a flaw that allows what's supposed to be a single-use encryption key to be resent and reused more than once, something the iOS operating system does not allow, but there's still a partial vulnerability.

Once patched, devices running iOS, macOS, tvOS, and watchOS will not be able to be exploited using the KRACK method even when connected to a router or access point that is still vulnerable. Still, consumers should watch for firmware updates for all of their devices, including routers.

so says https://www.macrumors.com/2017/10/16/krack-wifi-vulnerabilities-patched-apple-ios-macos/
 
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