Recently I’ve had a good deal of people ask me about SSH connections, and how they can better secure them, and I’ve been shocked at the sheer number of people that still use keyboard-interactive password authentication to log into SSH daemons. This article will explain the use of SSH keys and OpenSSH options to speed up and secure your SSH connection.
SSH options
There are a few useful options you can pass to OpenSSH to increase your verbosity, compress and speed up your ssh connection, and change your SSH cipher to something faster and more secure;
‘-v’ switch. This option will allow you to see debug output for outgoing SSH connections. Specifying ‘-v’ multiple times increases the verbosity level (maximum level 3).
‘-C’ switch. This option compresses all of your SSH data. Passing this option to OpenSSH may speed things up dramatically on slow networks, but on high-speed networks it will only slow things down.
‘-c’ switch. This option will allow you to change your cipher method. The default is 3des, which is a 3-way encryption method that is believed to be secure – however,...
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