Specifications

ADT60/AET60 Reference Manual version 1.5 November 2005
3. Fingerprint Scanner
BioCARDKey/BioSIMKey is built around the TouchChip Silicon fingerprint sensor. It is a fast, reliable and
inexpensive fingerprint peripheral, which can be used to authenticate users of computers and all kinds of
information technology devices.
The TouchChip
device is suitable for applications such as desktop access control, network security, Internet-
based applications and commercial verification and identification systems. It contains all the necessary
biometric components: fingerprint sensing, image optimization and matching. Application Programming
Interface (API) is also provided for easy integration into applications and to save a lot of development time.
(Please refer to Programmer’s Guide for more information on API.)
TouchChip
active capacitive sensing provides a much higher immunity to parasitic effects leading to a higher
signal-to-noise ratio and the ability to capture a wider range of fingerprints than competing technologies,
such as passive capacitive sensing.
Typically there are two processes involved in a biometric application:
Enrollment:
Before the identity of an individual can be verified via his/her fingerprints, it is necessary to capture one or
several fingerprint samples. This process is called enrollment. The samples are referred to as fingerprint
templates and can be stored on a broad range of media such as computer storage devices or smart cards.
Verification:
The verification process requires a user to verify his identity by placing his finger on the fingerprint scanner
sensor. The live fingerprint is compared with a stored template using a matching algorithm in order to
determine whether they represent the same set of fingerprints. The matching result is then made available
to the computer.
When using the fingerprint device, the security level is mainly governed by two parameters:
False Acceptance Rate (FAR):
FAR is the probability that a false sample matches with the original template previously extracted from the
subject’s fingerprint images during enrollment.
False Rejection Rate (FRR):
FRR is the rate at which the system incorrectly rejects a legitimate attempt to verify.
 Advanced Card Systems Ltd. Page 4 of 25