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You can include messages, art, etc on your ssh login, if you like that stuff It won’t stop hackers, but makes your legal case a small bit stronger

sudo vim /etc/issue.net

This is a private computer system is for authorized use only. You
You are not authorized. Logoff immediately or be subject to
civil and/or criminal charges and/or criminal penalties as well
costs incurred as a result of your unauthorized access,
entry, use, abuse, or tampering.

Any use of these systems and all files on these systems may be
intercepted, monitored, recorded, copied, audited, inspected, and
disclosed to authorized system administrators and law enforcement
personnel, as well as authorized individuals of other organizations
at our discretion.

By accessing, using, or abusing this system, you authorize
the maximum possible punishment and fines as well as your
Personal repayment of all financial restitution related
to your activity on, or through this system.
      _.-
   .'            \
  /               ,
 |     '       /  |  YOU ARE NOT AUTHORIZED!
 /__      ___ (  /
 \\  `-'-|`  \\ |   LOG OFF IMMEDIATELY!
  |'_/ .  `__/ /
  '._ /|\  ,--'   THIS SYSTEM IS FOR PRIVATE USE ONLY
     |_..;/
     '#''