Does securelogin module needs to have a certificate? securelogin seems to be a must to protect against spying login/password.  

However it is not clear (to me) whether it requires a SSL Certificate.
I couldn't find this info neither in its module page nor anywhere else  :
http://drupal.org/project/securelogin
(is it too obvious that it does not need to say ?).
Thanks
Yes, the securelogin module requires an SSL certificate. From the README file:


  Before enabling the module, you need to set up your server to support
   23 SSL.