create a randomly generated guid and image that can be read by a camera to a list

i would like to create a random encrypted images based on a 16 number guid number string. 4 simple steps 1. unload generate a random guid string for the users user id 2. Use camera to Take a selfie and use the guid to create a shape code like fb messenger 3. Share the code someway, sms, email 4. Use the app to read in that code by camera and add the user to your account list.