My first thought when I heard about this sort of technology was that – in my point of view – would be extremely easy to copy. Think about the police investigating a murder for example. All the police have to do is to find some fingerprints and then find the suspect. If the fingerprints match the suspect’s the case is almost closed.
It is so easy to find a good fingerprint. Also think about this: you are in a shop and you accidentally touch a surface made of glass for instance. Somebody, maybe the owner, could later find this fingerprint, copy it and then all he has to do is to try to get access to every bank in the town. Eventually he’ll find your bank and be able to steal your money.
Also somebody has mentioned that it would give some problems if your finger got wounded one way or another. It would probably mean that you should get a new “credit card” i.e. get your new fingerprint scanned into the system. And before you could do that, you would have to prove that it really is you. In my opinion: a lot of trouble.
Now I a better technology probably would be scanning of the eyes. Again you’ll have the same problem if your eye got damaged. But it would be more secure, because it is so much more difficult to copy an eye than copying a fingerprint.


