Moodle in English

Hello,
I am new to the forum, have been playing with moodle for a few months.

I am curious about the authorize.net enrolment module, I noticed that on the page where you put in your authorize.net configuration it is standard http page, is this safe? Is the data that I put in there safe? This was my main question, which is why I used this sub-forum, but also does anyone know how to make the entire admin https?

Thanks in advance for any input!

Cheers,
TC