There are many ways in which hackers and crackers can break into a Wi-Fi network. It is trivial if the network uses out of date security protocols or weak passwords. But even if the system is setup with the latest security measures, strong passwords, and firewall and malware protection, there are still ways and means that a malicious third party might access such a network. Writing in the International Journal of Wireless and Mobile Computing, researchers from China review the various hacking techniques that might be used and show what defensive measures might best be taken to preclude system compromise.
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Source: Phys.org