Checking for existing SSH keys

Before you generate an SSH key, you can check to see if you have any existing SSH keys.

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About SSH keys

You can use SSH to perform Git operations in repositories. For more information, see "About SSH."

If you have an existing SSH key, you can use the key to authenticate Git operations over SSH.

Checking for existing SSH keys

Before you generate a new SSH key, you should check your local machine for existing keys.

Note: GitHub improved security by dropping older, insecure key types on March 15, 2022.

As of that date, DSA keys (ssh-dss) are no longer supported. You cannot add new DSA keys to your personal account on GitHub.

RSA keys (ssh-rsa) with a valid_after before November 2, 2021 may continue to use any signature algorithm. RSA keys generated after that date must use a SHA-2 signature algorithm. Some older clients may need to be upgraded in order to use SHA-2 signatures.

  1. Open TerminalTerminalGit Bash.

  2. Enter ls -al ~/.ssh to see if existing SSH keys are present.

    $ ls -al ~/.ssh
# Lists the files in your .ssh directory, if they exist

  3. Check the directory listing to see if you already have a public SSH key. By default, the filenames of supported public keys for GitHub are one of the following.

    • id_rsa.pub
    • id_ecdsa.pub
    • id_ed25519.pub

    Tip: If you receive an error that ~/.ssh doesn't exist, you do not have an existing SSH key pair in the default location. You can create a new SSH key pair in the next step.

  4. Either generate a new SSH key or upload an existing key.

    • If you don't have a supported public and private key pair, or don't wish to use any that are available, generate a new SSH key.

    • If you see an existing public and private key pair listed (for example, id_rsa.pub and id_rsa) that you would like to use to connect to GitHub, you can add the key to the ssh-agent.

      For more information about generation of a new SSH key or addition of an existing key to the ssh-agent, see "Generating a new SSH key and adding it to the ssh-agent."