Design of Reconfigurable Hardware Security Module Based on Network Protocol Detection

, M.Sc. Thesis Sharif University of Technology Zohouri, Hamid Reza (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Nowadays, in the presence of different types of computer attacks and different methods of eavesdropping on network communications, nobody can deny the importance of cryptography. Hardware Security Modules that are specifically designed for this purpose are widely used as a fast and reliable tool for encrypting data in computer networks. In this project, using the common and well-known FPGA platform and by leveraging the reconfigurability feature of this platform and also by adding a network protocol detection module to the traditional architecture of Hardware Security Modules, a novel module has been designed and implemented that can encrypt and decrypt data in a communication network, at...

Design of FPGA Cluster Platform For Cryptanalysis Applications

, M.Sc. Thesis Sharif University of Technology Hosseini, Hamid Reza (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Daily improvements in technology and exchanging important information via internet and connection networks make data and connection security a significant problem. Cryptology is the branch of knowledge which concerns secret communications in all of its aspects. Two major areas of cryptology are cryptography and cryptanalysis. Cryptography is a branch of cryptology concerned with protecting communications from being read by unauthorized people.
Cryptologists design and create algorithms to improve cryptography along with finding methods to crack those algorithms. Cryptanalysis is a branch of cryptology concerned with cracking the cryptographic systems used by others.
Cryptographic...

Modeling and Data Mining of Partial Discharge in Power Transformer Solid Insulation

, M.Sc. Thesis Sharif University of Technology Jahangir, Hamid (Author) ; Vakilian, Mehdi (Supervisor)

Abstract

Transformers are one of the most important equipments in transmission and distribution networks. Transformer unplanned outages have severe impacts on the continuity of power system operation. To improve the reliability of transformers and to achieve an optimum operation cost, online condition monitoring of transformers is inevitable. Information about the quality of the transformers insulation system is known as the best parameter to be monitored in a transformer. Since partial discharge signals are initiated long before the beginning of a severe damage, partial discharge monitoring and its evaluation canbe employed to warn the operator.Data mining on the partial discharge signals extracts...

Assessment of the urban heat island in the city of Tehran using reliability methods

, Article Atmospheric Research ; Volume 225 , 2019 , Pages 144-156 ; 01698095 (ISSN) Jahangir, M. S ; Moghim, S ; Sharif University of Technology

Elsevier Ltd 2019

Abstract

Climate change affects temperature, magnitude, and also the duration of the Urban Heat Island (UHI), which has severe impacts on the environment, communities, and the people's lives. This study evaluates UHI formation in the city of Tehran (Iran) using a reliability framework, which is able to include related uncertainties into the modeling procedure. First, 2 km air temperature field from Weather and Research Forecasting (WRF) model is downscaled to a 50 m grid spacing using a probabilistic downscaling method, which combines inverse distance weighting (IDW) interpolation and a Bayesian regression model. This downscaling method not only can produce a long record of the fine resolution of the...

Analysis and Evaluation of Routing Protocols Conformance Test

, M.Sc. Thesis Sharif University of Technology Tabatabaee, Hosein (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Nowadays, one of the problems of network designers and users is the correctness of network equipment functionality. Since routers play an important role in information transfer between various networks and communicate with each other through a routing protocol, any violation of such protocol can result in the network's failure or defective transfer of data. Thus, being assured of the conformance of the implemented protocol in a router with what has been defined in the protocol's standard is of great significance. To this end, before using or exposing a router, network equipment testers should run protocol conformance tests on it and insure its correct functionality. This brings up the...

Network Traffic Analyzer

, M.Sc. Thesis Sharif University of Technology Silavi, Ehsan (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

In order to increase the network performance, to discover network security threats, to guarantee the quality of services, to simulate networks and develop new network protocols, network designers and operators need software tools to analyze the network traffic. The first step to do this analysis is network monitoring. This can be done by using various software and hardware tools.
In this research we developed a tool which analyzes the network traffic using appropriate statistical methods. The models which are analyzed in this application are: Poisson, Self-similar and Weibull. This application analyzes the network traffic based on this statistical models and calculates their parameters....

Analysis and Evaluation of Real Timeliness and Safety of VANET

, M.Sc. Thesis Sharif University of Technology Ahmadvand, Hossein (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

The increasing number of road accidents and fatalities have yielded the introduction of several solutions by related industries such as automobile manufacture. Proposed solutions can be classified into two categories: passive, such as airbags, and active such as ABS ad ITS-based technologies. Inter vehicles communication let the communication between vehicles(V2V) or between vehicles and road infrastructure (V2I) by relying on DSRC technology and standards. Intelligent Transportation System (ITS) has three main types of applications namely safety, traffic and commercial. Safety applications are the main goal of vehicular communication, and real time guarantee in safety applications is so...

Downscaling Tehran’s Temperature Field Using Machine Learning Algorithms and Geospatial Interpolation

, M.Sc. Thesis Sharif University of Technology Jahangir, Mohammad Sina (Author) ; Moghim, Sanaz (Supervisor)

Abstract

Due to climate change and the increase in the emission of greenhouse gasses, the temperature of the large cities is increasing. Tehran, which is the capital of Iran and the most populated city of it, is no exception. One of the significant tools for characterizing heat in the cities is having access to the temperature field of the region. Different tools can be used for achieving the temperature field. Two methods for doing so are remote sensing and numerical models. Each one of the mentioned methods has their own strength and weaknesses. In this research, the WRF-ARW model (version 3.7) is used for deriving meteorological fields for the city of Tehran. One of the many merits of using...

An Efficient Approach for Improving the Performance of Real-time Flow Routing in SDN Controllers

, M.Sc. Thesis Sharif University of Technology Heidari, Hossein (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

In real-time systems, jobs that miss their deadline are considered worthless or ineffective. Nowadays, real-time applications (such as multimedia) that communicate through software-defined networks (SDN) are widely used and will continue to expand in the future. SDN is an emerging network architecture in which control plane is separated from data plane to manage it directly. In this research, we make changes to the controller and the switch used in such network to deliver real time packets or real-time flows (such as video) on time, as much as possible. As missed deadline packets are worthless and they waste bandwidth, dropping them is a solution. Moreover, the controller can drop flows that...

Location-aware Key Management in Wireless Sensor Networks

, M.Sc. Thesis Sharif University of Technology Nikounia, Hossein (Author) ; Jahangir, AmirHossein (Supervisor)

Abstract

Wireless sensor networks have many applications, vary in size, and are deployed in a wide variety of areas. They are often deployed in potentially adverse or even hostile environment so security issues are of much concern in these networks. Key management is a fundamental security issue in sensor networks. In this thesis, we are mainly focusing on key establishment and group rekeying schemes aspects of key management. Due to limited resources of sensor networks, key pre-distribution schemes are currently viewed as the most promising solution. Key predistribution in sensor networks refers to the problem of distributing secret keys among sensor nodes prior to deployment. Recently, many key...

Reconfigurable Architecture For Cryptanalysis Applications

, M.Sc. Thesis Sharif University of Technology Noshadravan, Mohammad Reza (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Nowadays, the significance of securing data and information is undeniable. Cryptography is being used to provide data security. In addition, cryptanalysis is required to evaluate the effectiveness of cryptography methods, and hence, it is an essential concept for securing data. In general, the cryptography functions shall be designed in a way to impose a high load of time-intensive operations to prevent an adversary from accessing the main data from the encrypted data. As a result, cryptography and cryptanalysis algorithms need high performance computations. So far, a number of methods have been proposed to support the required performance. These methods include: distributed computing and...

Performance Ehancement of Congestion Control Algorithm Through Traffic Flow Istinction

, M.Sc. Thesis Sharif University of Technology Peyman, Zakariaei (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Congestion is an important issue in the network environment. To keep stable the perfor-mance of the network, congestion control algorithms have been extensively studied. Queue management method employed by the routers is one of the important issues in the congestion control study. Active Queue Management (AQM) has been proposed for early detection of congestion inside the network. AQM mechanisms control the queue length in a router by dropping arriving packets. The Random Early Detection (RED) is the most popular AQM mechanism used in routers on the Intenet to allow network users to simultaneously achieve high throughput and low average delay. The RED algorithm may cause heavy oscillation of...

Modeling and Analysis of Real-time Behaviour of Wireless Sensor Networks

, Ph.D. Dissertation Sharif University of Technology Mizanian, Kambiz (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Nowadays, information gathering based on wireless sensor network (WSN) has formed various applications and it also seems to be spreading more in future. Wireless sensor network, is a network composed of multiple nodes, without any infrastructure, each having one or more sensors, wireless communications unit, processing unit, memory, and power supply. Memory capacity, computation power, and power supply are usually considered as valuable resources and limited in nodes. Most of sensor nodes are located in a dense mode and they are susceptible to failure. Therefore network topology may vary dynamically. A sensor network can support real-time communications independent of its type of structure...

Suitable Architecture Selection for Protocol Identification

, M.Sc. Thesis Sharif University of Technology Anvari, Saeed (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Protocol identification and reverse engineering have recently received much attention due to their importance in many communication and security applications. In this field, the main challenges are: protocol identification, clustering unknown protocols, extracting protocol fields, and finding the protocol format based on these fields and their relations. Most of the proposed methods for the first two parts (protocol identification and clustering) use machine learning and AI techniques. For the last part, some bioinformatics techniques like sequence alignment algorithms are used. In this thesis, after reviewing different methods for protocol identification and reverse engineering, some...

Design of Realistic Network Traffic Generator and Traffic Anomalies

, M.Sc. Thesis Sharif University of Technology Azadmanesh, Maryam (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Generating realistic network traffic serves capacity planning, traffic engineering, understanding internet service performance and anomaly detection. A useful traffic generator must generate characteristics in flows and packets, and add known internet anomalies to legitimate traffic. In this dissertation, we develop a tool for generating realistic and anomalous traffic. This generator can generate traffic in a scalable, reproducible and stochastic manner. Two methods are proposed for this purpose. In the first method, the traffic is generated according to statistical distribution of packets and flow charactristics. In the second method, traffic is generated by modeling the behavior of...

Estimation of Network Parameters for use in Congestion Control Algorithm

, M.Sc. Thesis Sharif University of Technology Azimi, Arvin (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Many congestion control protocols proposed so far to alleviate the problems encountered by TCP protocol in high-speed networks and wireless links have to estimate the parameters of the network. For example, the TCP WESTWOOD congestion window is adjusted based on available bandwidth estimation, or TCP Vegas detects the congestion status based on RTT (Round Trip Time) estimation, and XCP protocol operates according to network traffic load. In this paper, we proposed a novel estimation algorithm that is based on burst identification techniques in router. we show through analysis and simulation that during burst periods this method can estimate the congestion window size of the specific flow...

A New Algorithm for Partitioning Problem in Hardware/Software Codesign

, M.Sc. Thesis Sharif University of Technology Tahaee, Abdoreza (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

We use an abstract model to perform hardware/software partitioning for embedded systems. The complexity of partitioning problem in the model is studied and we use a scheme to overcome its NP-Hardness. Partitioning problem can be considered as the main phase of high level synthesis. As it suffers from complexity, heuristic search methods are generally used to overcome its complexity. In this thesis we present a heuristic method (named Tendency algorithm) to increase the performance of heuristic searches, and use it in parallel with other tuning methods. We defind suitable initial point(s) for heuristic searches instead of tuning heuristic parameters. The thesis justifies the logic behind...

Distinguishing DDoS Attacks from Flash Crowds

, M.Sc. Thesis Sharif University of Technology Ranjbar, Hadi (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Distributed Denial of Service attacks are threats that target availability of network resources. One feature of this type of attacks is high volume of traffic or service request from huge number of illegitimate attackers that organize botnets together, which cause performance decrease of network. Nowadays, distinguishing huge number of legitimate users during Flash Crowd is one of the most challenging issues for network security experts. Most of proposed methods so far, did not have enough performance or were only applicable in short term, due to increasing attackers’ knowledge in mimicking legitimate users behavior. Methods based on extracting statistic features usually, have better...

Enhancing Scalability in Software-defined Networks

, M.Sc. Thesis Sharif University of Technology Shakeri, Sara (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Software Defined Networking (SDN) is an emerging paradigm which makes the network programmable by separating the control plane from data plane and makes both planes to work independently. There is a centralized controller and a programmable data plane in these networks architecture and forwarding data packets is realized by programming the data plane via an open interface called OpenFlow. OpenFlow is a communication protocol between control and data planes. The centralized architecture of these networks provides a global view of the underlying network to upper applications and brings numerous advantages such as routing, traffic engineering and QoS control. Despite these advantages there are...

Analysis and Evaluation of Intrusion Detection Systems Test Methods

, M.Sc. Thesis Sharif University of Technology Amiri, Behnam (Author) ; Jahangir, Amir Hossein (Supervisor)

Abstract

Intrusion detection systems’ test and evaluation is an active research area on which many researchers have been working for years. A complete and comprehensive test methodology that can be applied in reasonable time and cost is important and useful both to evaluate a newly designed system and to compare two or more existing systems to select an appropriate system for a particular network. In this research, we first determine the critical features of an IDS and then inspect methods and effective parameters that may influence the test process and propose a method for testing intrusion detection systems. In the proposed test methodology we only examine critical features which lake of them cause...