我必须使用什么加密程序在HTTP协议上发送加密的“电子邮件”和“密码”值?

I am using Ruby on Rails 3 and I would like to send 'email' and 'password' values (I know, I should not, but I need that) over the HTTP protocoll. I need to send user credentials from a I am using Ruby on Rails 3 and I would like to