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KRACK WI-Fi flaw, Norton alert 19 October 2017.
Huge thanks to Norton for today's (19 October 2017, UK time, UTC) e-mail introducing KRACK virus (Key Reinstallation Attacks). Which I'd never heard of. In meanwhile, located article in 'The Telegraph', 17 Oct (UK news media): a Belgium researcher found this problem and alerted it on Monday 16 Oct, instantly obvious most people also unaware. It concerns a flaw in Wi-Fi connections. The big names in ICT, internet (incl Norton), mobile devices etc are definitely working on patches and repairs.