Topic 1, Access Control
A potential problem related to the physical installation of the Iris Scanner in regards to the usage
of the iris pattern within a biometric system is:
A. concern that the laser beam may cause eye damage
B. the iris pattern changes as a person grows older.
C. there is a relatively high rate of false accepts.
D. the optical unit must be positioned so that the sun does not shine into the aperture.
Because the optical unit utilizes a camera and infrared light to create the images, sun light can
impact the aperture so it must not be positioned in direct light of any type. Because the subject
does not need to have direct contact with the optical reader, direct light can impact the reader.
An Iris recognition is a form of biometrics that is based on the uniqueness of a subject's iris. A
camera like device records the patterns of the iris creating what is known as Iriscode. It is the
unique patterns of the iris that allow it to be one of the most accurate forms of biometric
identification of an individual. Unlike other types of biometics, the iris rarely changes over time.
Fingerprints can change over time due to scaring and manual labor, voice patterns can change
due to a variety of causes, hand geometry can also change as well. But barring surgery or an
accident it is not usual for an iris to change. The subject has a high-resoulution image taken of
their iris and this is then converted to Iriscode. The current standard for the Iriscode was
developed by John Daugman. When the subject attempts to be authenticated an infrared light is
used to capture the iris image and this image is then compared to the Iriscode. If there is a
match the subject's identity is confirmed. The subject does not need to have direct contact with
the optical reader so it is a less invasive means of authentication then retinal scanning would
AIO, 3rd edition, Access Control, p 134.
AIO, 4th edition, Access Control, p 182.
Wikipedia - http://en.wikipedia.org/wiki/Iris_recognition
The following answers are incorrect:
concern that the laser beam may cause eye damage. The optical readers do not use laser so,
concern that the laser beam may cause eye damage is not an issue. the iris pattern changes as
a person grows older. The question asked about the physical installation of the scanner, so this
was not the best answer. If the question would have been about long term problems then it
could have been the best choice. Recent research has shown that Irises actual y do change
over time: http://www.nature.com/news/ageing-eyes-hinder-biometric-
there is a relatively high rate of false accepts. Since the advent of the Iriscode there is a very
low rate of false accepts, in fact the algorithm used has never had a false match. This all
depends on the quality of the equipment used but because of the uniqueness of the iris even
when comparing identical twins, iris patterns are unique.
In Mandatory Access Control, sensitivity labels attached to object contain what information?