[agwa]

If you have experience with RSA key pairs, using ed25519 key pairs is easy. To generate a key pair just run: ssh-keygen -t ed25519

As with RSA, this command generates a public and private key file. Put the public key in the authorized_keys file on the server side.

You'll need OpenSSH 6.4 on both the server and the client side. If you have an older version, I would not recommend upgrading outside of your operating system's normal upgrade channel because then you'll be responsible for security updates. Instead I would wait until your operating system has it.