Using PKI with SSH

If you're concerned about the global increase in brute-force SSH login attempts, you can use PKI to prohibit successful unauthorized authentication through password guessing.

Generate key pair
# keygen -b 1024 -t rsa -f ./rsa_id_clientname

Add/append public key to ~/.ssh/authorized_keys file on the target

Add/append a few lines to ~/.ssh/config on the client
Host
User
IdentityFile ~/.ssh/

Attempt new SSH session