Simple secure login php / javascript

Question

I want to create a secure login, so I want to encrypt the password before I send it as POST parameter. I am doing it with a SHA1 javascript function.

Then I realize that if someone intercepts the encrypted password, he can use it right away. Sending it as a post parameter the same URL.

How can I be sure that the password comes from the login input field? Maybe with a PHP session? I don't want to use secure http yet. Anyone has a simple alternative?

Answer 1

How can I be sure that the password comes from the login input field?

You can't.

The closest thing to that is the usual defences against CSRF … but that will only stop people tricking users into submitting data from their site to your site. It won't protect passwords.

I don't want to use secure http yet. Anyone has a simple alternative?

HTTPS is the simple option.