Simon Willison’s Weblog

1 item tagged “portknocking”

Novel security measures

An article on SecurityFocus led me to this site about Port Knocking. Port Knocking is an interesting security technique in which a box sits online with no ports open to connections and awaits a specific sequence of connection attempts. A user wishing to connect to the box must first attempt to initiate connections to ports in a specific, secret order. Once they do, the box starts up the required service (such as an SSH daemon) on a designated port and allows the user to connect properly.

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Related: security