Fingerprint scanners are used in places requiring high security and can now be purchased cheaply for personal use. They work by first scanning a fingerprint to create a digital image of ridges and valleys. The scanner then compares subsequent prints to the original stored image to authenticate identity. While fingerprint analysis provides strong security since prints cannot be guessed or lost, scanners can sometimes make mistakes in matching.

1. Fingerprint scanner is secure
Fingerprint scanner is used many places that
need high security for many years.
Now, we can buy personal fingerprint scanner
cheaply.
If we use this, our computer is protected more
secure. But we have to do one more step to
use computer at the same time. It’s fingerprint
scan.
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2. What is fingerprint?
Fingerprint is one of twist on all finger.
We have only own fingerprint. There is no
same fingerprint in the world.
Same fingerprint doesn’t exit even if twins.
We don’t understand difference in many
people’s fingerprints. But special persons or
high performance software can understand
difference.
So, fingerprint scanner can understand
particular person.
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3. Mechanism of fingerprint scanner
At first, fingerprint scanner gets our fingerprint
data and makes picture. And it has to know
our fingerprint’s ridges and valleys.
From next time, fingerprint scanner check
printed fingerprint’s pattern and compare with
data which is scanned at first time.
There are many methods to get fingerprint’s
information. It’s very complex.
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4. About capacitive fingerprint scanner
Capacitive fingerprint scanner makes picture
of our fingerprint’s ridges and valleys, too.
Standard fingerprint scanner uses fingerprint’s
shape. So, bad person can lie fingerprint and
do some bad thing.
But capacitive fingerprint scanner needs light
and dark patterns which constitute
fingerprint’s impressive when we look this.
Bad person can’t lie fingerprint easily in this
way.
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5. About fingerprint analysis
Fingerprint analyzer pile up two fingerprints
automatically and do pattern match on the
movie and TV.
But this way needs many processing ability.
Actually, almost fingerprint scanner compare
fingerprint’s particular characteristics that is
called minutiae.
This way is similar to constellation. We think
overall by only some points.
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6. Good points and bad points
Biometrics certification like fingerprint has
good points and bad points.
One of good points is that there is no person
who can guess fingerprint pattern. If we use
password, it’s guessed.
Another good point is that we can’t leave own
fingerprint. If we use card, we may leave it.
On the other hands, scanners make mistake
sometimes. It’s bad point.
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