login to unix remote with rsa key pair from windows

On Windows client, we need:

• PuTTY
• PuTTYgen
• Pageant

Use PuTTYgen to make key pair, save private key to file and copy public key to clipboard. Add key to Pageant.

On Unix remote, edit ~/.ssh/authorized_keys and add public key from Windows clipboard (one-line).

Use PuTTY to login to remote. WinSCP also uses Pageant when possible.