For Mac users, you can generate a public key using the terminal. Here are the steps: 

1. Open the Terminal window. Enter the following command `ssh-keygen -t rsa` 
2. Accept the default location for saving the key. 
3. Enter a passphrase and click "confirm." 
4. After you have confirmed the passphrase, the key pair will be generated. 

Your private key is saved to the id_rsa file in the .ssh directory. 

Your public key is saved to the id_rsa.pub file in the .ssh directory.