Using Secure Socket Layer for User Registrations and Profile Updates

[rainyleaves]

Has anyone tried using the Secure Socket Layer (SSL) for user registrations and user profile updates?
This looks like a "must have" for the security of the user registration data. With a large user membership (5-6 figures), all vB features can't be put inside the SSL.
Is there a plain and simple hack that allows user registration and updates through SSL (https://www.mydomain.com/vbulletin/) while keeping all other user interactions outside the SSL (http://www.mydomain.com/vbulletin/)?

Thanks.