Wi-Fi Sense has been a feature on phones running Windows 8.1, entering in your password on the phone would allow a computer logged in with the same Microsoft account to connect to your own wireless, with the password stored and encrypted on a Microsoft server.  It looks as though this feature will be available on all Windows 10 devices, sharing your wireless passwords with all of your Outlook, Skype and even Facebook contacts if you enable it.  This is certainly handy for when visiting as you will not need to ask for the wireless password at a friends house but does raise some security concerns.  If you happen to have Outlook contacts on your work machine which are not necessarily co-workers, they would be able to access your corporate network, as unfortunately would their contacts and even worse so could anyone who had compromised any of those accounts or machines.  The password is encrypted and not easy to access directly and the application does seem to limit access to WAN, somehow blocking access to the LAN even with proper credentials.  As The Register rightly points out, if a password is the totality of your access management protocols, you are already doing it wrong but this is something all users should be aware of.

"A Windows 10 feature, Wi-Fi Sense, smells like a security risk: it shares Wi-Fi passwords with the user's contacts."

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