http://dspace.dtu.ac.in:8080/jspui/handle/123456789/55 2026-04-28T04:03:24Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/17548 Title: ALTERNATIVE “IS ALIVE” BASED APPROACH FOR ALTERED FINGERPRINT IDENTIFICATION Authors: SHARMA, SAVITA Abstract: Fingerprint recognition for unique identification suffers from a disadvantage of being easy to imitate when compared to other forms of biometric authentications where surgical procedure is necessary. Different material can be used to mould and reproduce exact copy of a fingerprint with its detailed shape and extended characteristics (e.g. minutiae point locations). Recent research in this field shows the lack of aliveness detection mechanism in fingerprint sensors technology. Security issues with authentication device are a major concern in many applications. This work proposes the use of heartbeat as means of “is-alive” detection along with minutiae based fingerprint recognition to overcome the above stated challenges. 2010-08-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/17547 Title: FRACTAL IMAGE COMPRESSION Authors: ANWAR, TARIQUE Abstract: In context of medical imaging or satellite images, the change in conditions is to be observed at different times. There is a fact that the images captured of the same scene or the same object at different times may not have the same orientation. For the sake of automating the observation of the progress or the change in the condition of the object, there needs to be a technique to align the input image to the reference image. The technique used for the above process is known as image registration. The work under this project is divided in two phases. The first phase is about the image registration of the medical images. It is implemented using MATLAB. Second phase of the project deals with the compression of the images. The method of image compression chosen is Fractal image compression. Since the data in medical images are very crucial, It is not appreciable to loose data in compression-decompression process. As in fractal image compression, the decoding process involves the iteration on the image. If we increase the number of iterations, more accurate picture we can get back. The above mentioned fact is the reason to choose fractal image compression for the purpose of image compression. We realize the importance of compression methods in our daily life when we store files in a limited storage space or when we have to send a file on a slower network. In this thesis, the methods of compression of images is dealt with. Again, there are different approaches for image compression among which jpeg is a well known one. We judge the ability of a compression method by the compression ratio it provides. It is noted that for the images having fractal properties in terms of self similarity or the images having similar regions, the image compression method known as Fractal Image Compression can give better compression ratio. The fractal image compression algorithms have a common approach which involves the partitioning of the image into smaller non overlapping square subsections range blocks of predefined size. Then, a search codebook (domain pool ) is created from the image taking all the square blocks (domain blocks) of size double of the range blocks and ultimately for each each range block, the most appropriate domain block is selected from the domain pool. It is noted that that what transformations are required to be performed on the range block to match with the domain block. 2010-11-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/17546 Title: STUDY OF SOFT HANDOVER IN THIRD GENERATION Authors: HASDAH, RAJARSHI Abstract: UMTS is an emerging cell phone technology and it is basically another name for 3G mobile communication systems. It provides an enhanced range of multimedia services like video conferencing and high speed internet access. Sometimes UMTS is marketed as 3GSM emphasizing the both 3G nature and GSM standards which it was designed to succeed. UMTS is also European term for wireless systems based on the IMT-2000 standards. To utilize various merits in mobile telecommunication system which consist of various radio access networks, UMTS as Third Generation wireless technology utilizes a wideband CDMA or TD/CDMA transceiver and also cover large area. Handover is basically a function which continues the communication between users without any gaps when the hardware goes to a place where it finds no network coverage. When we talk in terms of cellular communications systems, handover is a process which is referred to the transfer of a connection from one cell to another. Handover time is generally between 200 and 1,200 milliseconds (ms), which accounts for the delay. In this thesis we are going to find the reasons for these factors which affect the Quality of service of handover. The main focus of this research is to study the some factors which really affect the handover phenomenon in UMTS that basically affect the overall quality of mobile network. For this we intend to find the solution for problems which born during the handover. Handover provides the mobility to users which are the main theme of wireless technology and it is also make the interoperability between different network technologies. 2010-11-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/17545 Title: HANDLING ARP BASED SPOOFING ATTACKS Authors: GARHEWAL, VINEET Abstract: he classic Man-in-the-Middle(ARP Spoofing) attack relies upon convincing two hosts that the computer in the middle is the other host. This can be accomplished with a domain name spoof if the system is using DNS to identify the other host or address resolution protocol (ARP) spoofing on the LAN. This thesis is designed to introduce and explain ARP spoofing and DNS spoofing and their prevention measures. Throughout the Internet, IP is used for communications. Once an IP packet comes into a Local Area Network (LAN) it must be converted into a packet that the LAN can understand. An IP packet is encapsulated into an Ethernet frame for local handling. Ethernet is the most common type of network and other types of networks handle communications differently. Ethernet does not communicate via IP addresses, but uses the hardware address instead. Ethernet uses the Address Resolution Protocol (ARP) to resolve IP addresses into hardware addresses. This hardware address is also called the Media Access Controllers (MAC) addresses. Once the destination’s MAC address is determined, the encapsulated IP packet can be transmitted to the host. Every network device must have an unique MAC address for the Ethernet LAN to function correctly. All Ethernet hosts and switches keep a list of MAC and IP address in a table and will request this information from the network when a new IP address is requested or a table entry expires. The TCP/IP protocol based host trusts on its IP/MAC table.ARP spoofing attacks involve tricking a system into modifying its MAC table and sending the data to the attacker instead. The purpose of this thesis is to look at several ways and methods for modifying ARP cache information and how to defend the network against ARP spoofing attacks. 2006-08-01T00:00:00Z