SSH Key Cheatsheet

As with all cheatsheets, this will be added to over time.

For the cheats below, you may replace [key path] with ~/.ssh/id_rsa if you are concerned with just your own computers key rather than a key file.

Create Key

ssh-keygen

Add Passphrase

If you were given an unencrypted SSH key, such as from AWS, then you probably want to add a passphrase to it with the following command:

ssh-keygen -p -f my-private-key.pem

Remove Passphrase

Just do the same again as adding passphrase, this time enter the current passphrase and then don't enter anything for the new one.

ssh-keygen -p -f my-private-key.pem

Generate public key from private key

ssh-keygen -f [key path] -y > [key path].pub

Add Key To Remote Server

Refer here if you wish to see how to easily add this key to a remote server so that you can use it to log in.

References

• ServerFault - Create a public SSH key from the private key?
• Unix & Linux - How can I determine if someone's SSH key contains an empty passphrase?
• Remove passphrase (password) from private RSA key
• Stack Overflow - How do I add a password to an OpenSSH private key that was generated without a password?