Ready for a new key? You should be.
The Ed25519 was introduced on OpenSSH version 6.5. It’s the EdDSA implementation using the Twisted Edwards curve. It offers a better security with faster performance compared to DSA or ECDSA. Some benefits:
Its faster, and compact – it only contains 68 characters, compared to RSA 3072 that has 544 characters. Generating the key is fast! It’s also fast to perform batch signature verification with Ed25519.
To generate a new SSH key that uses Ed25519 algorithm, run:
# ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C "firstname.lastname@example.org"
Enter a strong passphrase.
Adding Your Key to SSH Agent
# eval "$(ssh-agent -s)"
Then run the following command to add your newly generated Ed25519 key to SSH agent:
# ssh-add ~/.ssh/id_ed25519
Add a config file for easy access. Add an entry to the ~/.ssh/config file to configure these options:
Host myserver HostName 126.96.36.199 User roger IdentityFile ~/.ssh/id_ed25519 IdentitiesOnly yes
# ssh myserver