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Cope With a Malicious Host in Mobile Adhoc Networks Manet

Thesis Info

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Author

Faraz Ahsan

Supervisor

Mazhar Iqbal

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2012

Thesis Completion Status

Completed

Subject

Computer Science

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1924

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727721517

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From a security perspective, a jamming attack is easy to launch and relatively hard to detect. Jamming attacks are generally directed towards seizing the medium completely by transmitting fake packets violating the medium access protocol, either constantly or periodically. This work analyzes the effects of different types of jammers using Conservation of Flow (CoF), which has been useful for detecting other attacks in wired networks. Additionally, simulation results are presented in justification of proposed methodology. With the miniaturization of wireless devices, the popularity and usage has increased in recent past, especially due to portability. Since the design of such devices does not primarily emphasize heavy computation and secure communication, these are treated as add-ons. In setting up an ad hoc network rather than choosing all or more than the channels offered by 802.11 standard, only a single channel is generally utilized to minimize delay and synchronization issues. However, by using additional available multiple channels, significant gain in terms of overall system performance can be achieved. This, and other limitations like a shared medium which is open to all, attracts intruders in wireless networks. Mainly, the use of a lone channel can become single point of failure in case of an attack, especially a jamming attack. In contrast to other security attacks, no special hardware and computation is required in launching jamming attacks. Additionally, even if the attacker does not get hold of the communication, he can emit radio signals periodically to jam legitimate conversation. Thus, legitimate nodes escape physically or logically to avoid a jammer at the cost of additional overhead involving coordination amongst nodes to resume communication. The overhead involved in either of the methods is considered worthy in terms of regaining the performance of the network. In this thesis, a couple of MAC layer-based algorithms are proposed to mitigate the effects of jamming attacks efficiently; the first is a reactive mechanism and the second is a proactive proposal. The work starts with an investigation of different jamming types and their effects on wireless communication. For this purpose, a simulation model was developed and the resulting data set was verified using AI algorithms, which predicted 98% accuracy. Next, a reactive technique namely packet-feed is proposed to keep the jammer busy on the jammed channel. Once the nodes detect the existence of the jammer and hop to another channel, they alternatively visit the earlier channel to feed the jammer with valid packets. This way, the nodes pretend to the jammer that the earlier channel is still in use. Finally, a proactive channel hopping protocol is proposed where each node has a separate and dynamically selected control channel. Additionally, rather than each of them feeding the other its channel hopping sequence, both parties coordinate to come up with a new channel where data transfer can take place. Thus, provision of redundant channels is provided to each node. Following on from this, the proposed idea is analyzed with the existence of a jammer.
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زندہ ہے بھٹو

زندہ ہے بھٹو

                                                                                                                رضا زیدی

سیدھی بات ہے جو موت کو ،امیر المومنین علی ؑ کی سنت پر دلیری سے عمل پیرا ہوتے ہوئے ۔کامیابی سمجھ کر گلے سے لگائے وہ بھٹو بن جا تا ہے ۔اس کی زندگی کا مذاق اڑانے یا جلنے والے جلتے جلتے مر جاتے ہیں ۔مٹ جاتے ہیں اور بھٹو گردشِ لیل و نہارکے ساتھ ساتھ اپنی زندگی ،اپنے وجود اور اپنی خوشبو محسوس کراتا رہتا ہے ۔۔۔۔زندہ ہے بھٹو جلنے والے دفع دور رہیں ۔

جب تک سورج رہے گا

بھٹو تیرا نام رہے گا

یہ شخص ایک شکست خوردہ ملک کا سربراہ تھا ۔سامنے والی خاتون فاتح تھی اور اس کی قید میں اس شخص کی نوے ہزار سپاہ تھی اور اس کی زمین کا خاطر خواہ حصہ اس خاتون کے قبضے میں تھا ۔پھر بھی اس شخص کے چہرے پر اعتماد اطمینان اور اس کی بدن بولی دیکھیے ۔ایک شکست خوردہ ملک کا صدر مذکرات کی میز پر وہ سب کچھ جیت گیا جو ہم ممیدانِ جنگ میں ہار چکے تھے ۔

 

سیرت نبوی ﷺ کا اجتہادی پہلو

Establishment of khilafah and tamkeen fil ‘ard means supremacy of the dictates of shari‘ah and socio-political justice on earth. This is one of the basic objectives and prominent messages of the Holy Quran and Seerah of Prophet Muhammad (s.a.w). About khilafah and tamkeen fil ‘ard the Holy Quran expresses as:   -وَعَدَ اللَّهُ الَّذِينَ آمَنُوا مِنكُمْ وَعَمِلُوا الصَّالِحَاتِ لَيَسْتَخْلِفَنَّهُم فِي الأَرْضِ …  -الَّذِينَ إِن مَّكَّنَّاهُمْ فِي الأَرْضِ أَقَامُوا الصَّلاَةَ وَآتَوُا الزَّكَاةَ وَأَمَرُوا بِالمَعْرُوفِ وَنَهَوْا عَنِ المُنكَرِ وَلِلَّهِ عَاقِبَةُ الأُمُورِ.  -هُوَ الَّذِي أَرْسَلَ رَسُولَهُ بِالْهُدَى وَدِينِ الْحَقِّ لِيُظْهِرَهُ عَلَى الدِّينِ كُلِّهِ وَكَفَى بِاللَّهِ شَهِيداً.  Prophet Muhammad (s.a.w) proclaims:   - وَاَللَّهِ لَوْ وَضَعُوا الشَّمْسَ فِي يَمِينِي وَالْقَمَرَ فِي يَسَارِي عَلَى أَنْ أَتْرُكَ هَذَا الْأَمْرَ حَتَّى يُظْهِرَهُ اللَّهُ أَوْ أَهْلِكَ فِيهِ مَا تَرَكْتُهُ. The Holy Quran and the Seerah refer to some underlying milestones on the way of religious nations to status of khalafah and tamkeen fin ‘ard. These milestones may be expressed in an order as: da‘wah [preaching], deen [practices of prophetic teachings], hijrah [migration], ma‘iyyat-ul-Allah [companionship of Allah], qital [wars], nusrat-ul-Allah [divine aid], izhar-ud-deen [domination of deen] and khilafah [inheritance of authority]. This is noteworthy that journey of khalafah and tamkeen fin ‘ard begins with da‘wah [preaching towards deen] and passing through various milestones ends up again at da‘wah, as obvious from ayat-ul-istakhlaf quoted above. Therefore, the seekers of khilafah and tamkeen fil ‘ard should strive hard and keep struggling with the work of da‘wah with dedication in all circumstances and all means as per time and place requirements in lined with the modus operandi of Prophets, particularly Prophet Muhammad (s.a.w), instead of awaiting the status of khilafah and tamkeen fil ‘ard as prerequisite to start with the work of da‘wah and establishment of deen. This paper primarily aims to elaborate the milestones of Muslim Ummah to reach to the status of khilafah and tamkeen fil ‘ard. It also cast light on the objectives of khilafah and tamkeen fil ‘ard. This work provides useful guidance to Muslim Ummah in general and Ahlud da‘wah in particular about milestones and objectives of khilafah and tamkeen fil ‘ard.

Performance Evaluation of Rc Structures under Earthquake Loading

Existing seismic risk in Pakistan, especially in its Northern Areas, emphasis for a detailed and careful design of RC structures to withstand expected earthquake loads. The seismic performance of RC multistory structures is a complex process. An accurate assessment of seismic behavior of RC structures requires an analysis carried out under time history or parameters of time history of real time recorded earthquakes. In Pakistan, a large data bank of strong motion recorders exists in analog form, and its use in performance assessment of structures is very difficult without digitizing it. The response of a multistory RC building is greatly dependant on performance of its columns especially in inelastic range, which can be improved by providing sufficient confinement. Post earthquake surveys revealed that most of the RC buildings collapsed due to insufficient performance of their columns, which were found deficient in confinement. A limited work has been carried out in Pakistan to study the performance of RC columns under axial and lateral loading. Internationally, the efforts are continued to enhance the performance of RC columns subjected to seismic loads. The objective of this research has three main parts. The first part is to collect, segregate and digitize available analog form of earthquake data, which has been recorded in Pakistan. The second part is to device and test a technique which could enhance strength, ductility and stiffness of RC columns subjected to seismic loads and result in lesser residual deformations. The third part is to carry out seismic analysis of a RC multistory frame, using material behavior studied experimentally, under application of ground motion data of Pakistan. A novel digitizing technique is developed in this study that extracts the trace of recorded acceleration as a whole by saving all points required to draw digitized ground acceleration. The proposed digitizing approach has been compared with the available techniques to assess its efficiency. The confinement technique for RC columns developed in this study utilizes specialized rings of steel strips applied as transverse reinforcement in hinge zone. Eight large scale specimens have been cast and tested to study the performance of proposed technique. The experimental results indicated that proposed confining reinforcement, although with lesser volumetric ratio, improved the performance of RC columns by enhancing their shear resistance, ductility, energy dissipation capacity and reducing residual deformations. iiThe columns confined by proposed technique have been named as Steel Strip Confined (SSC) columns. The observed column behavior has been modeled in Response-2000 and DRAIN-3DX. RC frames are modeled in DRAIN-3DX using material properties calibrated with experimental data. The frames are analyzed under north-south component of El Centro ground motion and east-west component of Kashmir earthquake recorded at Abbottabad. The frames, modeled with properties of SSC columns, showed better performance by reducing the damage. The analysis indicates that Kashmir earthquake is more damaging in nature than El Centro ground motion.