Hi,
those two cover pretty much what you want to achieve I think:
https://ubuntuforums.org/showthread.php?t=1409993
https://www.rackaid.com/blog/how-to-block-ssh-brute-force-attacks/
** Changed in: openssh (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1628926
Title:
Postpone login attempts if X successive attempts have failed
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