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iOS security update files are crypto signed, so it's safe to download them on public WiFi.

• fragmede 9y ago
  Not in this case. If your wifi chipset is known to be compromised, and there is a remote exploit available, as in this case, then merely connecting with wifi to an evil hotspot is enough to compromise a device. Once a device's been compromised, crypto signatures on update files won't protect you, as the signature checking itself can no longer be trusted.