Removing an SSH Public Key (2024)

Delete the line containing the SSH public key that you want to remove from the authorized_keys files associated with the opc user (/home/opc/.ssh/authorized_keys) and the oracle user (/home/oracle/.ssh/authorized_keys).

Caution:

The authorized_keys files may contain numerous keys and altering or removing the wrong key may result in a loss of functionality. To minimize the likelihood of an error make a copy of each authorized_keys file before making any modification. Also, rather than deleting the line containing the public key that you wish to remove, you can disable the key by tagging it with the @revoked marker. For example:

@revoked ssh-rsa AAAAB5W...
Removing an SSH Public Key (2024)

FAQs

Removing an SSH Public Key? ›

How do I remove a key from ssh-agent ? To remove a specific key, use the command ssh-add -d ~/.

How to remove public key in SSH? ›

Deleting SSH Keys
  1. Step 1: Log into the Remote Server. You need to have administrative access to the remote server to delete SSH keys for a user. ...
  2. Step 2: Locate the SSH Directory. ...
  3. Step 3: Identify the Key to Delete. ...
  4. Step 4: Delete the Key. ...
  5. Step 5: Verify Deletion. ...
  6. Step 6: Restart SSH Service (Optional)
Oct 10, 2023

How to remove authorized keys in SSH? ›

Four Steps to Remove SSH Keys
  1. SSH to your server. ssh <user>@<server ip>
  2. Edit file ~/.ssh/authorized_keys using your favorite editor (e.g. vi, nano, pico) vi ~/.ssh/authorized_keys.
  3. Remove the line that corresponds to your key.
  4. Save the file and exit (command below applies to 'vi' editor) Hit 'Esc' button, then type wq!
Jan 30, 2023

How do I remove a key from ssh-agent? ›

How do I remove a key from ssh-agent ? To remove a specific key, use the command ssh-add -d ~/.

How do I delete an existing SSH key in Windows? ›

Delete an SSH key
  1. From the Secure Client main window, click Manage Security.
  2. The Security Manager tab is displayed.
  3. Click the User button and select the SSH Keys option.
  4. Select a key from the User SSH Keys table and click Delete.
  5. A confirmation dialog box is displayed.
  6. Click Yes to delete the selected key.
Apr 25, 2024

How do I revoke a public key? ›

If you manually created a revocation certificate:
  1. navigate to your revocation certificate in finder.
  2. open GPG Keychain.
  3. drag the revocation certificate in question into the main window.
  4. carefully read and confirm the dialog to revoke your key.
Jan 12, 2023

How do I disconnect from SSH key? ›

Click on a VPS and click on Manage VPS, to go to the management page. On the Overview page, select Access tab and click Add SSH key. Enter the name of the SSH key and the Public key, and click Submit. The SSH key is generated and provides a fingerprint (short way to identify the long Public key).

What happens if you delete a SSH key? ›

After your inactive SSH key is deleted, you must generate a new SSH key and associate it with your account. For more information, see "Generating a new SSH key and adding it to the ssh-agent" and "Adding a new SSH key to your GitHub account."

How to remove pubkey in Linux? ›

You can use the gpg –delete-secret-key command followed by the KeyID or key fingerprint to delete the secret key and gpg –delete-key command followed by the KeyID or key fingerprint to delete the public key.

How to disable SSH public key authentication? ›

Disable public key authentication in SSH
  1. Log into SSH.
  2. Edit the file with your favorite editor: /etc/ssh/sshd_config.
  3. Lookup the variable: PasswordAuthentication and change 'no' to 'yes'
  4. Save and close the file.
  5. Run this command: service sshd reload.

How do I remove a SSH key from PuTTY? ›

Windows with PuTTY
  1. Search for regedit.exe and open it.
  2. Navigate to HKEY_CURRENT_USER/SOFTWARE/SimonTatham/PuTTy/SshHostKeys.
  3. Right click the offending key and click delete.

How to remove a user from SSH? ›

To completely remove a user's access, enter the ZSSHD MANAGE command with the DELETE and ALLKEYS parameters specified. This command removes the key file for the specified user (/certs/authorized_keys/ username . keys) and revokes their access to the SSH server.

How do I remove a deploy key? ›

If you cannot see the "Settings" tab, select the dropdown menu, then click Settings. In the "Security" section of the sidebar, click Deploy keys. On the "Deploy keys" page, take note of the deploy keys associated with your account. For those that you don't recognize, or that are out of date, click Delete.

How do I delete a public key? ›

To delete the SSH public key: In the application web interface window, select the Settings → Application access → SSH access section. This opens the SSH public key table. Select the key that you want to delete.

How do I remove authorized keys? ›

Connect to the compute node as the opc user. See Connecting to a Compute Node Through Secure Shell (SSH). Delete the line containing the SSH public key that you want to remove from the authorized_keys files associated with the opc user ( /home/opc/. ssh/authorized_keys ) and the oracle user ( /home/oracle/.

How do I remove SSH from my PC? ›

Removing from Windows
  1. Open the Control Panel and double-click the Add or Remove Programs option.
  2. Select SSH Tectia ConnectSecure from the list of installed programs and click the Remove button.
  3. Click Yes to confirm.

How to disable public key in SSH command line? ›

Disable public key authentication in SSH
  1. Log into SSH.
  2. Edit the file with your favorite editor: /etc/ssh/sshd_config.
  3. Lookup the variable: PasswordAuthentication and change 'no' to 'yes'
  4. Save and close the file.
  5. Run this command: service sshd reload.

How do I delete the RSA key? ›

To delete the local key pair, run rsa local-key-pair destroy command. If the host key pair and the service key pair of an SSH server are deleted, run the rsa local-key-pair create command to create the new host key pair and service key pair for the SSH server.

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