Something you are (or do?


Signature biometrics

  • Positives – none listed
    • Not very effective or reliable
    • Signatures are generally unique, but many are very similar
    • Legitimate author of a signature signs slightly different every time and it makes it hard to correctly measure the percentage of accuracy
    • Some people have practiced forms of calligraphy that allow them to accurately forge fake signatures and therefore could make the authentication method unreliable

Iris Recognition

  • Positives:
    • eyes are protected against wear and damage; fine texture allows it to maintain it self for many years
    • iris textures are unique (no two people with the exact same eye)
    • don’t need to touch equipment (eliminates possibility of someone retrieving the iris data and reusing it that is possible with fingerprints)
    • accurate
    • can’t “forget” eyes like one does with passwords
    • regarded as most secure method of authentication
  • Disadvantages:
    • iris scanners can be tricked by high-definition photos (privacy issue)
    • hard to adjust scanners for people with varying heights
    • light conditions affect the scanner (doesn’t work in the dark)
    • more expensive than other authentication methods
    • difficult to scan iris at distances, when moving, or person not cooperating well
    • some governments can use the scanners to track people
    • people with disabilities related to the eye may not be able to use it (blind people have white glaze over eye)
    • eyes change color based on lighting or what surrounds them (color of shirt)

Hand Geometry

  • Positives
    • easy to collect
    • not intrusive
    • no complicated hardware requirements (only need properly placed cameras)
    • fast and precise enough to be used for verification
  • Negatives
    • if there is a problem with cameras, the authentication will not work
    • hand size, shape, and other geometric features change frequently
    • many updates for the system
    • accurate positioning of the hand is necessary for verification

Semantic Face Retrieval Biometrics
  • Positives
    • if there is no picture of someone, using just a description a close image can be constructed
  • Negatives
    • when describing someone, a completely different person can be chosen (people have similar characteristics)

Skin Spectroscopy

  • Positives
    • many different skin types that differ with light so not everyone has same light absorption/scattering = difficult to find someone with exactly same skin type
    • skin cannot be remade by anybody or faked
  • Negatives
    • it is possible to find someone with the same skin type
    • skin changes (weight loss/gain, tattoos)
    • still not operational and fully functional

Fingerprint Recognition/3D Fingerprint Scanning

  • Positives
    • no two prints are identical
    • faster to scan fingerprint than to type in password
    • provides more security (can easily access someone's password)
    • 3D: no longer have to touch the scanner
    • 3D: a 3D image is more reliable
    • 3D: more effective and secure
  • Negatives
    • may be distortion due to injuries or dirtiness causing the scanner to not be able to recognize the fingerprint
    • fingerprints can be worn down
    • not a hygienic process since have to touch the scanner
    • easy to fake

Finger Vein Recognition

  • Positives
    • more reliable than just the fingerprint
    • impossible to replicate
    • is unique to each person
    • doesn't work with fingers that have been cut off
  • Negatives
    • not a hygienic process

Voice Recognition

  • Positives
    • Everyone has a single voice that can be used to unlock things
    • only recognizes your voice
  • Negatives
    • when a person is sick, one's voice may not be recognized because it sounds different therefore not allowing the person to access what they need
    • a person's voice changes throughout their life