In palm recognition a 3-dimensional image of the hand is collected and compared to the stored sample. Palm recognition devices are cumbersome artefacts (unlike fingerprint and iris recognition devices) but can absorb perform a great amount of identification acts in a short time. They are therefore preferably installed in situations where a large number of people is identified, as in airports.
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Black propaganda does not tell its source. The recipient cannot find out the correct source. Rather would it be possible to get a wrong idea about the sender. It is very helpful for separating two allies.