ssh-keygen instructions for windows (tortise, putty, winscp, etc)

The gist of it is.  

Create a public/private key in linux using ssh-keygen

Move the private key to authorized_keys in the .ssh folder

Move the private key to windows.

Use puttygen to load the existing private key (from linux) and save the private key (in the windows key format).

Use pageant to load the keys.  Then putty, winscp, tortise will use pageant as a key proxy and not more passwords.

http://linux-sxs.org/networking/openssh.putty.html