How to use SSH keys with PuTTY on Windows
The PuTTY SSH client for Microsoft Windows does not have the same key format as the OpenSSH client. If you want to use PuTTY, you’ll first need to create a new SSH public and private key. You can do this using the PuTTYgen tool. Alternatively, you can also convert an existing OpenSSH private key. In this tutorial, you’ll find step-by-step instructions on how to do this.