I am dealing with a multi-step form, and I need to pass information from step 1 to step 2, then from step 2 to step 3, and so on.
Step 1 contains a membership number and ID number entry, as well as another identifier (3 fields to complete to identify the visitor). At this moment I use RIJNDAEL encryption to encrypt the data before passing through to the next step via hidden fields, but somehow, I am corrupting the data (it does not decrypt again). I will fix it, but:
My question: Is it really dangerous to leave these items unencrypted in the first place if you're using HTTPS?