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After 14 years of going unnoticed, a vulnerability in Wi-Fi security was published last week. It's a serious problem, but it's already in the process of being fixed.

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Sources:
https://www.krackattacks.com/?_ga=2.191235242.1088205245.1508159331-752582413.1498767319
https://papers.mathyvanhoef.com/ccs2017.pdf
https://www.youtube.com/watch?v=9M8kVYFhMDw
https://www.wired.com/story/krack-wi-fi-wpa2-vulnerability/
https://www.lifewire.com/what-is-wpa2-818352
https://www.techopedia.com/definition/27188/four-way-handshake
https://www.wired.com/story/krack-wi-fi-iot-security-broken/
http://smallbusiness.chron.com/s-https-stand-for-64240.html