risan/generate-ed25519-ssh-key.sh Secret

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Generate SSH key with Ed25519 key type

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generate-ed25519-ssh-key.sh

ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519 -C "john@example.com"

hudsantos commented Aug 13, 2021 •

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Good one! RSA no more!! Thanks for sharing.

Just no need the -o for new format in this case. As you said in your article "Actually, this option is implied when you specify the key type as ed25519."

man ssh-keygen says "Ed25519 keys always use the new private key format":

 -o      Causes ssh-keygen to save private keys using the new OpenSSH format rather than the more compatible PEM format.  The new format has increased resistance to brute-force password cracking but is not supported by versions of OpenSSH prior to 6.5.  Ed25519 keys always use the new private key format.

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