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Biometrics, referred as the science of recognizing an individual based on his or her physical or behavioral traits, has been widely employed as a security system in the awake of latest security issues. However, recent researches have shown that many biometric traits are vulnerable to spoof attacks. In addition, a latest result have questioned that, contrary to a common claim, multimodal systems can be cracked by spoofing only one trait. Those results were obtained using simulated spoof attacks, under the unrealistic assumption that the spoofed and genuine samples are identical, turned out to be the same outputs.
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