ssh is just about the most secure way you can provide access to a system. But even ssh is subject to attacks. You can reduce the likelihood of a breach even further with a few fairly simple steps. The specifics below are for Ubuntu 16.04, but the principles are the same for any modern Unix.
Tag: ssh
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A warning word about telnet
Someone just asked (on a network operators list!) whether
telnethad a vulnerability, because he knew of a switch that was on the Internet and accessible viatelnet… This was my response.