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The wi-fi connections of businesses and homes around the world are at risk, according to researchers who have revealed a major flaw dubbed Krack.It concerns an authentication system which is widely used to secure wireless connections, experts said it could leave "the majority" of connections at risk until they are patched. The researchers added the attack method was "exceptionally devastating" for Android 6.0 or above and Linux.A Google spokesperson said: "We're aware of the issue, and we will be patching any affected devices in the coming weeks."The US Computer Emergency Readiness Team (Cert) has issued a warning on the flaw."US-Cert has become aware of several key management vulnerabilities in the four-way handshake of wi-fi protected access II (WPA2) security protocol," it said. "Most or all correct implementations of the standard will be affected."