The Best Way to Verify Identity

I remember seeing a tv program about the East German Secret Police and the kind of stuff they kept on file. They even developed a method for saving smells and and they had a massive catalog of smells from different crime scenes. The show went on to say that though the methods of gathering evidence worked, and they gathered a tremendous amount of it, they soon had so much data that they could not sort through it and were no longer able to function....oh, and my point was I can steal your smell and brake into your computer, along with every one else, and have so many stolen credit card numbers that I won't know which one to use.