Android exposed by KRACK in WPA2 wifi security

The latest cyber security crisis concerns a vulnerability in the Wifi Protected Access II security protocol and seems to be especially problematic for Android devices.
In time-honoured fashion the first priority was to find a nice acronym for it, and little time was wasted in agreeing on KRACK as a sort of abbreviation of Key Reinstallation Attacks. We have the people who discovered the vulnerability to thank for that as well as the website krackattacks.com, which explains how it works in the vi