Protecting HTML Form with PHP

Hi,

I'm using HTML Form to send information of my visitors (Visitor submit this form directly) to destination.com as follow:

<form name="form1" action="http://destination.com/receiver" method="post">
<input type="hidden" name="Login" value="My-Username">
<input type="hidden" name="Passwd" value="My-password">
<input type="hidden" name="Cust" value="John Doe">
<input type="hidden" name="Total" value="100">
<input type="submit" value="Submit">
</form>

This HTML Form is the only method that destination.com can accept.

But this is very big security issue, since people can use 'View Source' and get my login and username.

How to protect my login and password from being viewable to the world but the form still work ? May be hide it somewhere? Or other method?

Please advice.

Thank you.

what do you mean when you say: "this method is the only thing destination.com can accept" ?? you can always encrypt the date md5() and then post it...