Biometric functionality[ edit ] Many different aspects of human physiology, chemistry or behavior can be used for biometric authentication. The selection of a particular biometric for use in a specific application involves a weighting of several factors. Universality means that every person using a system should possess the trait. Uniqueness means the trait should be sufficiently different for individuals in the relevant population such that they can be distinguished from one another.
There are different types of fingerprint readers on the market, but the basic idea behind each is to measure the physical difference between ridges and valleys. All the proposed methods can be grouped into two major families: The procedure for capturing a fingerprint using a sensor consists of rolling or touching with the finger onto a sensing area, which according to the physical principle in use optical, ultrasonic, capacitive or thermal captures the difference between valleys and ridges.
When a finger touches or rolls onto a surface, the elastic skin deforms. The quantity and direction of the pressure applied by the user, the skin conditions and the projection of an irregular 3D object the finger onto a 2D flat plane introduce distortions, noise and inconsistencies in the captured fingerprint image.
These problems result in inconsistent and non-uniform irregularities in the image. The representation of the same fingerprint changes every time the finger is placed on the sensor plate, increasing the complexity of any attempt to match fingerprints, impairing the system performance and consequently, limiting the widespread use of this biometric technology.
In order to Thesis biometric security these problems, as ofnon-contact or touchless 3D fingerprint scanners have been developed.
By modelling the distance between neighboring points, the fingerprint can be imaged at a resolution high enough to record all the necessary detail.
However, a MythBusters episode revealed that this doesn't work at least with the scanners available to the program. But Adam Savage and Jamie Hyneman found a way to convert fingerprints lifted from the hand to a photographic form that the sensor would accept. For obvious reasons, they refuse to reveal the technique.
Latent detection Use of fine powder and brush to reveal latent fingerprints Fingerprints Thesis biometric security of a burglary scene In the s criminal investigators in the United States first discovered the existence of latent fingerprints on the surfaces of fabrics, most notably on the insides of gloves discarded by perpetrators.
The basis of the traditional fingerprinting technique is simple.
The skin on the palmar surface of the hands and feet forms ridges, so-called papillary ridges, in patterns that are unique to each individual and which do not change over time.
Even identical twins who share their DNA do not have identical fingerprints. The best way to render latent fingerprints visible, so that they can be photographed, can be complex and may depend, for example, on the type of surfaces on which they have been left.
Developing agents depend on the presence of organic materials or inorganic salts for their effectiveness, although the water deposited may also take a key role. Fingerprints are typically formed from the aqueous-based secretions of the eccrine glands of the fingers and palms with additional material from sebaceous glands primarily from the forehead.
This latter contamination results from the common human behaviors of touching the face and hair. The resulting latent fingerprints consist usually of a substantial proportion of water with small traces of amino acids and chlorides mixed with a fatty, sebaceous component which contains a number of fatty acids and triglycerides.
Detection of a small proportion of reactive organic substances such as urea and amino acids is far from easy. Fingerprints at a crime scene may be detected by simple powders, or by chemicals applied in situ.
More complex techniques, usually involving chemicals, can be applied in specialist laboratories to appropriate articles removed from a crime scene. A city fingerprint identification room. Laboratory techniques Although there are hundreds of reported techniques for fingerprint detection, many of these are only of academic interest and there are only around 20 really effective methods which are currently in use in the more advanced fingerprint laboratories around the world.
Some of these techniques, such as ninhydrindiazafluorenone and vacuum metal depositionshow great sensitivity and are used operationally. Some fingerprint reagents are specific, for example ninhydrin or diazafluorenone reacting with amino acids.
Others such as ethyl cyanoacrylate polymerisation, work apparently by water-based catalysis and polymer growth. Vacuum metal deposition using gold and zinc has been shown to be non-specific, but can detect fat layers as thin as one molecule.
More mundane methods, such as the application of fine powders, work by adhesion to sebaceous deposits and possibly aqueous deposits in the case of fresh fingerprints. Following work on the use of argon ion lasers for fingerprint detection,  a wide range of fluorescence techniques have been introduced, primarily for the enhancement of chemically developed fingerprints; the inherent fluorescence of some latent fingerprints may also be detected.
Fingerprints can for example be visualized in 3D and without chemicals by the use of infrared lasers. A technique has been developed that enables fingerprints to be visualised on metallic and electrically conductive surfaces without the need to develop the prints first.
These measurements can then be mapped to produce an image of the fingerprint. A higher resolution image can be obtained by increasing the number of points sampled, but at the expense of the time taken for the process.
A sampling frequency of 20 points per mm is high enough to visualise a fingerprint in sufficient detail for identification purposes and produces a voltage map in 2—3 hours. As ofthis technique had been shown to work effectively on a wide range of forensically important metal surfaces including iron, steel and aluminium.
While initial experiments were performed on flat surfaces, the technique has been further developed to cope with irregular or curved surfaces, such as the warped cylindrical surface of fired cartridge cases. Research during at Swansea University has found that physically removing a fingerprint from a metal surface, for example by rubbing with a tissue, does not necessarily result in the loss of all fingerprint information from that surface.
The reason for this is that the differences in potential that are the basis of the visualisation are caused by the interaction of inorganic salts in the fingerprint deposit and the metal surface and begin to occur as soon as the finger comes into contact with the metal, resulting in the formation of metal-ion complexes that cannot easily be removed.General aspects of biometric systems Thesis objectives Thesis content Chapter 2.
Conceptual models for fingerprint recognition Security module Biometric recognition refers to a number of methods for uniquely recognizing a . Trust & Security issues in Mobile banking and its effect on Customers Jenny Lundberg, PhD School of Computing This thesis is submitted to the School of Computing at Blekinge Institute of Technology in partial fulfillment of the requirements for the degree of Master of biometric scanning device which can identify the customer’s finger.
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