[ Thanks to An Anonymous Reader for
this link. ]
“Summary: Security always requires a multi-layered
scheme. SSH is a good example of this. Methods range from simple
sshd configuration through the use of PAM to specify who can use
SSH, to application of port-knocking techniques, or to hide the
fact that SSH access even exists. Applying these techniques can
make life much harder for possible intruders, who will have to go
past three unusual barriers.“Introduction
“If you require remote access to your computer and you enable
Secure Shell (SSH) connections, you must accept that you will
automatically attract hackers who will try to break your defenses
and take command of your machine. Although there’s no guarantee
that your machine won’t be “0wn3d” by a “h4x0r,” a few simple
solutions can help reinforce your SSH door and make life a bit more
difficult for anybody trying to break in. This article considers
three such techniques:”