RSA was a standard for asymmetric SSH keys for years, but if you are using keys below 2048-bit length you are not safe these days. But don’t worry, say hello to your new elliptic curve algorithm, ED25519 which is faster, more secure, and shorter in bytes.

Generate your new key

bash $ ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C ""