There’s an old saying in IT: The best way to secure a server is to leave it off. While humorous, this security method is obviously not helpful, but there’s a somewhat similar, ultra-secure technique that is useful—power the server on but leave it off the Internet. The server can be part of a local area network, but this network is not connected to the Internet and is therefore isolated making it impossible for malware to get on the machine without human help. This technique is called “air gapping” and is commonly used in ultra-secure environments such as government and military installations.

from Forbes – Tech http://ift.tt/20EvSsi
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