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ssh-keygen

Similar output will be:

$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa): test
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in test.
Your public key has been saved in test.pub.
The key fingerprint is:
01:01:43:22:c2:ec:24:85:f3:88:44:88:d6:df:7d:ea Luke@lukeshost

Now we need to copy the public key onto the server

ssh-copy-id -i ~/.ssh/servername_id_rsa.pub [email protected]

You can then log into the device using the private key:

ssh -i ~/.ssh/servername_id_rsa [email protected]

If the private key matches the public key located on the server then it will allow you to log in!