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132 Network Security Illustrated used in numerous applications Stand-alone fingerprint and handprint scanners check to see if the incoming print is in the allowed database Voice recognition systems match incoming patterns to lists of known words and phrases Recognition systems can be set to automatically enroll any unrecognized measurement They can also be set to reject already recognized measurements This combination is useful for situations where a person can only participate a single time Authentication systems compare the scanned measurement to a particular expected measurement associated with a digital identity A user first claims his or her identity by either supplying a username or a physical identifier, such as a smart card The authentication system then retrieves the expected measurements from a database It then compares the user s measurements to the stored values If a match is found, the user will gain access according to the privileges specified in his or her digital identity There are many different types of biometric devices in use today all over the world While the main function of all types of these systems is to identify and authenticate, they each perform the task with a unique style Fingerprinting has long been used to track criminal and citizens alike The tip of every finger has a characteristic known as friction ridges These friction ridge patterns appear to be similar overall, but no two friction ridges are exactly the same Police forensic teams have learned to quickly identify identical sets of prints based on patterns within the ridges Biometric systems have taken the concept of fingerprinting to new heights The biometric interface specifically images the ridges of the fingertips using an especially touch-sensitive scanner The pattern is converted to a digital file and is securely stored in a database or is compared to an already stored image The same process used by forensic teams is performed in less than a second by a special combination of hardware and software Consumer biometric devices have been available to the casual user for quite some time Fingerprint scanners for PC computers are available as stand-alone devices, and have also been built into mice and keyboards The fingerprint scanner can be used to prevent unauthorized access to the PC Some software also uses the fingerprint as an encryption key This means a fingerprint can be used to protect individual files from prying eyes Face recognition software is one of the more recent developments in the field of biometrics It is far more complex in function, but based on the same principles as fingerprint scanning Face recognition works by employing a combination of scanning hardware and processing software The hardware includes discreet high-resolution digital video cameras that can be placed virtually anywhere Face recognition software takes the digital image of your face provided by the camera and uses advanced statistics to identify patterns A common technique is to break the image into a grid, and create a table (matrix) showing the average amount of darkness in each grid region A mathematical technique called eigenspace is used to simplify the table, reducing the image to a set of unique equations The.

(continued)

Coddec is able to reconstruct the following listing from the COD file (All comments have been added manually by this chapter s author to clarify the disassembly)

Figure 4-10

.

//Notice that the method name has been recovered public final run( comrimsamplesdevicehelloworlddemoPrimeThread ); { enter_narrow //Top of the while loop Label1: sipush 3000 i2l //Invoke the Threadsleep function invokestatic_lib sleep( long ) // Thread aload_0_getfield dier iconst_1

Listing 4-11

Barh (correct)

//Compare the dier field to constant 1 if_icmpne Label1 return astore_1 goto Label1 }

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