Q:

Encrypting ASP.NET text fields at client-side and decrypting them at server-side

I have a content-sensitive firewall between my clients and my server. If we exclude SSL solution (it's not available in my case) then I was thinking of a javascript library which encrypts custom fields at client-side and a .NET class decrypts them at server-side.
Is there any solution out of the box (maybe a server control) ?

A:

If you want to just hide the data from being inspected/tracked by the firewall, then you can use simple ROT13 or XOR or other trivial obfuscation to mangle the text data that is posted. You will need to do this on field-by-field basis and you will need to employ JavaScript, of course. both ROT13 and XOR methods are trivial to implement in both JavaScript and C#. 

