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week12

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week12

  1. 1. Introduction to How Fingerprint Scanners Work ● Computerized fingerprint scanners have been a mainstay of spy thrillers for de cades, but up until recently, they were pretty exotic technology in the real wo rld. ● In this article, we'll examine the secr ets behind this exciting development in law enforcement and identity security.
  2. 2. Fingerprint Basics ● Fingerprints are one of those bizarre t wists of nature. ● Human beings happen to have built-in, e asily accessible identity cards. ● You have a unique design, which represe nts you alone, literally at your finger tips.
  3. 3. Optical Scanner ● A fingerprint scanner system has two ba sic jobs -- it needs to get an image of your finger, and it needs to determine whether the pattern of ridges and valle ys in this image matches the pattern of ridges and valleys in pre-scanned image s.
  4. 4. Capacitance Scanner ● Like optical scanners, capacitive finge rprint scanners generate an image of th e ridges and valleys that make up a fin gerprint. ● But instead of sensing the print using light, the capacitors use electrical cu rrent.
  5. 5. Analysis ● n movies and TV shows, automated finger print analyzers typically overlay vario us fingerprint images to find a match. ● In actuality, this isn't a particularly practical way to compare fingerprints.
  6. 6. Pros and Cons ● There are several ways a security syste m can verify that somebody is an author ized user. ● Most systems are looking for one or mor e of the following: ● What you have ● What you know ● Who you are

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