公開鍵・秘密鍵作成コマンドで、 $ ssh-keygen -t ed25519 と打つと、色々聞かれますが、全て規定値で問題ないので、 エンターを押しまくります。 Generating public/private ed25519 key pair. Enter file in which to save the key (/Users/[user name]/.ssh/id_ed25519): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/[user name]/.ssh/id_ed25519. Your public key has been saved in /Users/[user name]/