Vulnerabilities of Biometric Authentication “Threats and Countermeasures”
Biometric systems have a powerful potential to provide security for a variety of applications, systems are nowadays being
introduced in many applications and have already been deployed to protect personal computers, Banking machines, credit
cards, electronic transactions, airports, high security institutions like nuclear facilities, Military Bases and other applications like
borders control, access control, sensitive data protection and on-line tracking systems. While biometrics may improve security
in different environments and serve many purposes, biometric systems, like any other security system, have vulnerabilities and
are susceptible to threats. they are susceptible to external vulnerabilities of biometric systems so that their weaknesses can be
found and useful countermeasures against foreseeable attacks can be developed The increasingly high profile use of biometrics
for security purposes has provoked new interest in researching and exploring methods of attacking biometric systems. Abdulmonam Omar Ahmed Alaswad, Ahlal H. Montaser, Fawzia Elhashmi Mohamad(0-2014)
Reconstruction of Medical Image Registration and Applications in EIT
Medical image registration is process for determining
the correspondence of features between two medical collected at
different times and different position or using different imaging
modalities, where the aim is to follow changes in two imaging. The
aim in Electrical Impedance Tomography (EIT) is to exploit the
difference in the passive electrical properties of tissues in order to
generate a tomographic image. The advantage of such a technique
over other imaging modalities is that it provides a non-invasive and
sensitive method of probing the body using non ionizing radiation.
This paper will Shows the reconstruction of image registration and
application in multi frequency electrical impedance tomography.
Using by the determination of the appropriate coordinate transfer
function (CTF), the image reconstruction has been improved, and the
all information in the image can be obtained.
Amani Soliman, (3-2018)
Multi-frequency Electrical Impedance Tomography: Image Reconstruction Using Complex Sensitivity Matrix with Finite Element Methods
: Electrical Impedance Tomography (EIT) is a non invasive imaging technique with widespread applications in
medicine and industry. It aims to image the conductivity distribution within an object by making electrical
measurements on the surface of the volume.
Single frequency electrical impedance tomography offers many positive attributes which are now being exploited
clinically, but there are also problems which have been identified. Multi-frequency electrical impedance tomography
has been proposed to solve this problem by making impedance measurements over a range of frequencies. The reason
for this is that the impedance of biological tissues varies with frequency, and the variations are different from tissue to
tissue. It is therefore possible, in principle to make static image (i.e. images of the distribution of frequency dependence
of the impedance within the body) by measuring tissue impedance over a range of frequencies.
In this paper new method concerning multi-frequency electrical impedance tomography have been developed.
In the this new developed method; current density and finite element method have been used for the derivation of the
complex sensitivity matrix. The new developed method was applied in some models and acceptable results were found.
By using these method it possible to produce improvement and fast image reconstructions.