Encrypting HTTP POST data

Question

I have a HTTP POST string that I am running from a client cpp program against a server running Apache. Following is the POST string that would get fired from the clients:

"POST %s HTTP/1.0\r\n" 
"Host: %s\r\n"
"Content-type: multipart/form-data\r\n"
"Content-length: %d\r\n\r\n"
"Content-Disposition: %s; filename: %s\n"

It would be nice if someone could help me out to understand how could I encrypt the data that sits in the Content-Disposition: field. Also, I noticed that even if I put something irrelevant to the right of the POST string, like: "POST %s HTTPGarbage/1.0\r\n", the transfer still happens, it would be grand if I am informed about this behavior as well.

Answer 1

If you use HTTPS (which is essentially HTTP over SSL/TLS), all the HTTP traffic will be encrypted from the moment the SSL/TLS connection is established (provided you're using the appropriate cipher suites), that it, before any HTTP communication. Only the server certificate (which may reveal the host name) will be visible, and perhaps the client certificate in some circumstances (if you're also using client-certificate authentication). The URL and all the HTTP headers (and content) will be protected with SSL/TLS this way.

If you're not using a browser as a client you can make use of existing SSL/TLS libraries such as NSS (Mozilla) or OpenSSL. Make sure you configure the certificate trust and host name verification correctly.