vb.net barcode scanner tutorial Figure 9-10 Enrollment process in Software

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Figure 9-10 Enrollment process
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After users are enrolled, their biometrics are used to verify their identity. To authenticate someone, his or her biological feature is acquired from the sensor and converted to a digital representation, called a live scan. Then the live scan is compared to the stored biometric template. Typically, the live scan does not exactly match the user s stored template. Because biometric measurements almost always contain variations, these systems
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cannot require an exact match between the enrollment template and a current pattern. Instead, the current pattern is considered valid if it falls within a certain statistical range of values. A comparison algorithm is used to determine whether the user being verified is the same user that was enrolled. The comparison algorithm yields a result that indicates how close the live scan is to the stored template. If the result falls into an acceptable range, an affirmative response is given; if the result falls into an unacceptable range, a negative response is given. The definition of acceptable differs for each biometric. For some biometrics, the system administrator may set the level of the acceptable range. If this level is set too low, however, the biometric fails to be a valid authentication mechanism. Similarly, if it is set too high, the authorized users may have trouble being authenticated. Pattern matching is fundamental to the operation of any biometric system and therefore should be considered a primary factor when you re evaluating a biometric product. Figure 9-11 illustrates a typical verification process.
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Figure 9-11 Verification process
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In general, most available biometric authentication mechanisms function as explained in the preceding sections. One key feature of biometrics is the template. The accumulated templates of all users are referred to as the template database. These databases require the same protections as password databases. The size of the templates vary from system to sys-
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tem. When you re testing these systems for accuracy, you should examine the templates to determine whether unique biometric features are adequately represented. Another aspect of templates that affects biometric authentication is the approach taken by the comparison algorithm in using the template. Most devices use the template for verification, but some use it for identification. In the latter, the device takes a live scan and then compares it against the entire template database to determine whether any of the stored representations falls within the acceptable comparison algorithm range. In contrast, a biometric verification compares the live scan only against the single template of the person whom the user claims to be. For example, a user types a user name and then submits to a live scan for verification. The comparison algorithm compares the scan only to the template associated with that user name. Typically, verification biometrics are faster because they do not have to compare the live scan against the entire template database.
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Recognition Methods
Just as every human body has countless unique characteristics, countless recognition methods can be used in biometrics. Let s look at some of the common biometric recognition methods in use.
Fingerprint Recognition
Fingerprint recognition is probably the most common form of biometrics available. This form of data encryption has evolved from the use of fingerprints for identification over the past several decades. By having an individual scan a fingerprint electronically to decode information, the transmitter of the data can be certain that the intended recipient is the receiver of the data. When scanned electronically, fingerprints provide a higher level of detail and accuracy than can be achieved with manual systems. Another strength of fingerprint biometrics is that giving fingerprints is more widely accepted, convenient, and reliable than other forms of physical identification, especially when technology is used. In fact, studies have shown that fingerprint identification is currently thought to be the least intrusive of all biometric techniques. One concern of fingerprint biometrics is that latent prints left on a scanning medium will register a prior user; however, units exist that do not operate unless a live finger is on
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