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I would like to know wether somthing like this can be easily achieved, any suggestions?+

thx in advance

+1  A: 

The only possibility would be reading in fingerprints via the camera. However if you focus on a finger, it's simply not sensitive enough to discern the separate lines that make up a fingerprint.

So, the only possibility would be dedicated hardware that could read fingerprints and talk to the phone.

Kendall Helmstetter Gelner
Thx for all the comments on this issue, i've wondered myself about some apps doing this kind of job and wether it is something serious or notmaybe we will see apple doing some kind of interesting hardware changes in the future
Julian Weimer