**1.1 Biometric concept**

Biometric structure helps to find out the person with the physical-behavioral mechanism using statistics from person. [4], there are two types of biometrics: conventional and cognitive, conventional refers to physical and behavioral characteristics, such as fingerprint, voice, oder, DNA, face, iris, retina. Etc., cognitive refers to mental state signals as electroencephalography (EEG), these biometrics are unique for every individual. Physical biometrics is distinguished by "what the individual is" while behavioral is distinguished by "how individual do," cognitive is "what individual think" [5]. **Figure 1** illustrates biometric types.
