If the bad guys can't guess the username then they can't brute force the password. If you absolutely can't prevent your users choosing weak passwords, then consider using randomly generated or difficult to guess usernames for your user accounts. Further information on passwords can be found in the CentOS documentation: The benefits of strong passwords aren't specific to ssh, but have an impact on all aspects of systems security. special characters such as ! " £ $ % ^ etc) Hopefully you already use strong passwords, but if you are not then try to choose passwords that contains: With strong passwords in place, hopefully any attack will be logged and noticed before it can succeed. Typically a hacker will scan for port 22 (the default port on which ssh listens) to find machines with ssh running, and then attempt a brute-force attack against it. One of the first things you'll notice if you have ssh running and exposed to the outside world is that you'll probably log attempts by hackers to guess your username/password. However, a default installation of ssh isn't perfect, and when running an ssh server there are a few simple steps that can dramatically harden an installation. SSH has made protocols such as telnet redundant due, in most part, to the fact that the connection is encrypted and passwords are no longer sent in plain text for all to see.
OpenSSH (or Secure SHell) has become a de facto standard for remote access replacing the telnet protocol. Use Public/Private Keys for Authentication.It enables users to gain the access to Unix and Linux hosts easily or securely on a Windows workstation.
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