ssh-keygen -t

ssh-keygen -t ed25519 options: [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]

ssh-keygen -t ed25519 -f ~/.ssh/your_new_ed25519_key

ed25519

• There is no need to set the key size, as all ed25519 keys are 256 bits

• FIDO: ecdsa-sk and ed25519-sk.

Related

• ssh-keygen -t rsa
• ssh-keygen -t dsa

See also

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

https://man7.org/linux/man-pages/man1/ssh-keygen.1.html