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This article is about human fingerprints. For "digital fingerprints," see message digest.
A fingerprint is an imprint made by the pattern of ridges on the pad of a human finger. These prints are often left on objects at a crime scene and are therefore used in forensic science to identify suspects. No two humans have ever been found to have identical fingerprints, thus fingerprints are widely believed to be unique.
The tip of a finger showing the fingerprint. Fingerprints are an early example of biometrics, the science of identifying individuals by their physical characteristics. There is no clear date at which fingerprinting was first used, some examples being from prehistory. However, some significant modern dates are as follows. Sometimes the prints are invisible, in which case they are called latent fingerprints, but there are chemical techniques such as cyanoacrylate fuming and ninhydrin spray that can make them visible.
Recently the American Federal Bureau of Investigation adopted a wavelet-based system for efficient storage of fingerprint data, developed by Ingrid Daubechies.
In the 2000s, electronic fingerprint readers have been introduced for security applications such as identification of computer users (log-in authentication). However, early devices have been discovered to be vulnerable to quite simple methods of deception, such as fake fingerprints cast in gels.
There is some controversy over the uniqueness of fingerprints. Even those who accept their uniqueness sometimes argue that the techniques used to compare fingerprints are fallible.
 The same fingerprint as it would be detected on a surface. Fingerprint analysis (or Dactylography, a term mainly used in the US) is the science of using fingerprints to uniquely identify someone. Humans leave behind prints of the ridges of the skin on their fingertips when handling certain materials. The pattern of ridges is thought to be unique for each person and in practice has proved unique enough to identify the person who left the fingerprint.
Fingerprint analysis emerged in the early 20th century, when it was the first method in forensic science for unique identification. As a result of its early success, it acquired a mystique of infallibility. It has only recently been subjected to systematic analysis by investigators from outside the field.
Fingerprint examiners have certainly disagreed with one another: the case of Shirley McKie was a notable case involving fingerprints.
William West
The most famous case in the history of fingerprinting occurred in the late 19th century when a man was spotted in the incoming prisoner line at the U.S. Penitentiary in Leavenworth, Kansas by a guard who 'knew' him and had just seen him already in the prison population. Upon examination, the incoming prisoner claimed to be named Will West, while the (not escaped) existing prisoner was named William West. According to their Bertillon measurements they were essentially indistinguishable. As they were not twins, the Bertillon system came into some question. However, their fingerprints were different, and fingerprint identification received a significant boost in credibility.
Classifying fingerprints There are three basic fingerprint patterns: Arch, Loop and Whorl. There are more complex classification systems that further break down the pattern to plain arches or tented arches. Loops may be radial or ulnar. Whorls also have smaller classifications. However, the five most commonly used are: whorl, right loop, left loop, arch and tented arch.
Arch
Loop
Whorl
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