What we really need is a hash code in the ID that can't easily be guessed.

Serial numbers are great. But what we really need is a hash code that can't easily be guessed. For instance, a unique hash based on date and time and user input details, and that the user receives as a unique code to request some information etc in the future.

I had considered a code based on date/time and user email, for instance, but that would be pretty guessable. Even if I create an algorithm in the background that performs multiplications and substitutions that can still be decrypted.

Random numbers don't help: there's a chance to entries get the same number.

An MD5 hash or something in those lines would be awesome.

If you want to include symbols such as a hash in the ID then you may please check out the Random Value Generator widget. This widget will be displayed on your form and it is also possible to customize it as well by including or excluding numbers, letters, symbols, uppercase or lowercase characters.

Hope this helps.

Do get back to us if you have any questions.