Ssh-keygen -t ed25519

ssh-keygen -t ed25519
Generating public/private ed25519 key pair.
Enter file in which to save the key (/root/.ssh/id_ed25519):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_ed25519
Your public key has been saved in /root/.ssh/id_ed25519.pub
The key fingerprint is:
SHA256:YespmSF5+y3rDJllanqWJeWJ9V2X7YUyvU5t53cioX0 root@demo_machine
The key's randomart image is:
+--[ED25519 256]--+
|                 |
|                 |
|        o    . .o|
|    o o=So . + =.|
|     oo%+.. o o =|
|      @+o  o + o.|
|     o+=... o E +|
+----[SHA256]-----+

See also

• ssh-keygen [ -R, -t | -p | -i | -y | -f | ~/.ssh/id_rsa | --help ] ~/.ssh/known_hosts