How can one securely transmit HTML's sentive data to a server besides declaring "post" value to method attribute in form tag?

Question

Designing a page that accepts data such credit card numbers and passwords requires secure transmission. How can this be achieved?

Answer 1

i managed to build this form using many sources over internet , and it actually works. But do not know if it is good against any breaks.

<form action="/some/server/some.cgi" method="POST"> <fieldset> <legend>contact me:</legend> <input type="hidden" name="recipient" value="[e-mail]"> <input type="hidden" name="subject" value="message "> <br> <br> <table> <tr> <td> <input type="text" name="name" placeholder="Your Name please" size="30" maxlength="30" title="Your name (no numbers)" pattern="[a-zA-Z]{2,30}" required> </td> </tr> <tr> <td> <input type="email" value="email" name="email" placeholder="Provide valid email please" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}quot; title="Your VALID email address" size="30" maxlength="50" required> </td> </tr> <tr> <td> <input type="text" name="message" placeholder="Message" size="30" maxlength="200" title="Long text is not allowed" pattern="[a-zA-Z0-9\s]{5,200}" required> </td> </tr> <tr> <td> <input type="submit" value="Send" name="Submit"> </td> </tr> </table>