Have you ever experienced this: you forgot the password for one app because you have so many different kinds of passwords, either a combination of numbers and letter or something that requires capital letter or slash or some buzzard combination. At the same time you also have to worry that someday someone will hack your phone or app because they find a way to find your password. But actually we human have a unique "built-in" keyword: fingerprint.
On people's skin, there are tiny "ridges" and "valleys" that make us easier to grasp. And DNA and environmental factors that affect the formation of fingerprint so each person has a unique fingerprint pattern, even a twins. So the unique characteristic of fingerprint makes it a great password for us: it is a key that you will never forget and lose.
Most fingerprint system analyzes some specific fingerprint features, commonly known as minutiae. That is analyzers focus on the pints on the fingerprint where one ridge line split into two. Scanner systems usually use complex algorithm to to analyze these minutiae.Several minutiae points are scanned in memory when people first registered,and after that if a scanned fingerprint matches these minutiae then it will be considered a match and then log in for the device.
Sources:
1.http://www.androidauthority.com/how-fingerprint-scanners-work-670934/
2.http://gizmodo.com/how-the-iphone-5ss-fingerprint-scanner-works-and-what-1265703794
3.http://biometrics.mainguet.org/types/fingerprint/fingerprint_algo.htm
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