is he absolutely necessary both for the page with the form, and for the page that will be transmitted to HTTPS. If the page with the form does not have HTTPS, you cannot guarantee where this form is submitted. It may not actually go to the HTTPS page (you expect your visitors to see the source), or something may have inserted some kind of malicious javascript to redirect the form to another location. However, if the form is also HTTPS, you know that it has not been modified.
Security is more than just marking the box that says “I have encryption,” it's a whole process.
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