The most common user names and passwords on Linux

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The following picture is taken from DRG SSH Username and Password Authentication Tag Clouds to see if you have your own commonly used password, and if so, change it as soon as possible.

If you are still worried about ssh, you can use the following simple ways to further enhance the security of ssh, but keep in mind that the following tips are not a substitute for a good password:

Modify and configure DenyUsers, AllowUsers, DenyGroups and AllowGroups to allow only related personnel to log in to ssh

Generate public/private key, modify AuthorizedKeysFile, and log in to ssh as ssh key

Prohibit PasswordAuthentication no

Disable direct login of root, PermitRootLogin no

Change the default port 22 of ssh to another number (for example, 2012).

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