After you have configured “sshd_config” in Win32-OpenSSH to enable key authentication feature and have copied your public key to “%systemdrive%\users\user\.ssh\authorized_keys” as written on their Wiki, the publickey authentication still does not work.
The missing step, not well documented, consists in copying “ssh_lsa.dll” to “%WINDIR%/System32” directory, and adding “ssh-lsa” string to the “HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Lsa/Authentication Packages” registry key.
Hey man, you’re on windows, don’t forget to reboot! 😉