Generating a new SSH key and adding it to the ssh-agent - GitHub Docs

After you've checked for existing SSH keys, you can generate a new SSH key to use for authentication, then add it to the ssh-agent. About SSH key passphrases You can access and write data in repositories on GitHub using SSH (Secure Shell Protocol). When you connect via SSH, you authenticate using a private key file on your local machine. For more information, see About SSH. When you generate an SS

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GitHub では `ed25519` が推奨。