Sabri

Sep 212017
 

Dear All,

You are cordially invited to the upcoming seminar with details below

Speaker: Alvaro Garcia-Recuero

Title:  Privacy vs Abuse detection in Decentralised Online Social Networks

 

Abstract:

Today supervised learning algorithms are widely used for abuse detection, namely spam, bot and even hate speech in centralised Online Social Networks. However, literature investigating the utility of supervised learning to detect abuse in future Decentralised Online Social Networks is scarce. In a decentralized setting, there is no central authority to control the infrastructure that collects and protects the privacy of users’ metadata; so that it is in the hands of individual participants to employ protocols that protect privacy of metadata correctly. Decentralised sites as Twister already provide a similar user interface to a centralized one as Twitter, but with a very different underlying architectural design to protect such metadata. To start assessing the Privacy vs Abuse trade-off, we collect a

corpus of messages and social relations from Twitter to identify which metadata we need to consider sensitive or private in future decentralised settings. In practice, this means reducing the number of features available to learning algorithms for abuse detection. We only collect metadata available in the vicinity of the potential victim, namely at most at one-hop distance in the network. For the metadata that we consider private or sensitive, we design a privacy-preserving protocol that protects it in order to avail its use with the supervised learning algorithms. We show how using supervised learning for abuse detection is compatible with a future Decentralised Online Social Network design, effectively avoiding the sort of Big Data mining performed by large centralised Online Social Network providers. In addition, our latest results apply “data minimisation” techniques that achieve more efficient computation of the privacy-preserving protocol and still yield similar abuse detection rates.

 

Bio:

Álvaro García-Recuero holds a PhD in Computer Science by University of Rennes 1, developed under the supervision of Christian Grothoff (PhD UCLA) and awarded by an international jury composed of Bogdan Carbunar (Florida International University), Carmela Troncoso (IMDEA Software) and Pierre-Alain Fouque (UR1).

His background is in Distributed Systems and his research interests range from the design of Privacy-Enhancing Technologies for Online Social Networks to the measurement of Big Data frameworks and Energy Efficiency issues in networked systems. Since 2013, holds a double joint Master Degree in Distributed Computing with the oldest and largest engineering school in Portugal (IST) and one of the most renowned in Europe (KTH). Prior to that, he worked in a number of multinationals and high-tech software development companies, obtaining a valuable career track-record while graduating with Upper Merits on a BSc in Information Systems & Information Technology at Dublin Institute of Technology.

He has published research related to Cloud Computing, Online Social Networks and Privacy at ACM/IEEE/Springer recognised venues such as CloudCom, ASONAM and ESORICS Data Privacy Management workshop respectively. He releases his research contributions as Free Open Software on his github, thus trying to support free software and support reproduceable scientific research. He is always interested in bold, challenging ideas that push-forward innovation and research.

 

For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

 

Venue: Francis Bancroft 2.41

 

Time and Date: 2 to 3 PM, Wednesday, 27/09/17.

 

Please keep the dates in your calendar

 

Any comments, advice would be appreciated.

 Posted by on September 21, 2017
Aug 042017
 

Dear All,

You are cordially invited to the upcoming seminar with details below

Speaker: Roger Baig Viñas

Title: Community Networks

Abstract:
Community Networks (CNs) are acknowledged drivers for a truly empowering Internet Inclusion, as they imply the involvement of the communities in the design, construction, maintenance and operation of their own telecommunications infrastructure. Fostering their adoption poses an excellent opportunity for contributing to extend the internet in an inclusive and democratic manner. Nevertheless, their horizontal and participative nature poses challenges in many knowledge areas. For instance, technical solutions must be put in place to lower the technical barriers as much as possible to enable effective
involvement of citizens; legal certainty and fair distribution of costs and efforts is required to protect investments; etc. This seminar is aimed at triggering the discussion on how the academia can help to address these challenges. To do so, we have organise it in two parts, the first as a presentation and the second the debate. In the presentation, we will review the most relevant challenges and we will make a short summary of how they have been faced by guifi.net –the largest community network in the world with over 40.000 nodes. We encourage everybody to join, regardless the background, because contributions of all kinds are welcome in participatory projects as community networks.

Bio:
Roger Baig Viñas received his degree in Industrial Engineering (2002) at the Universitat Politècnica de Catalunya (UPC) and currently is doing a PhD at the same univeristy. In 2011, he joined the Foundation for the Neutral, Free and Open Network – guifi.net as a
researcher. He has been volunteering in the guifi.net community network since 2006. There he has actively contributed in many aspects such as organising community events, promoting projects, giving talks, etc. and has gained a broad knowledge about community networks. His current research interests are focused on community networks, including dynamic routing protocols, socio-economics and management of community networks.

For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Eng 324

Time and Date: 2 to 3 PM, Wednesday, 16/08/2017

Please keep the dates in your calendar

Any comments, advice would be appreciated.

 Posted by on August 4, 2017
Jun 102017
 

Dear All,

You are cordially invited to the upcoming seminar with details below

Speaker: Chunjing Yuan

Title: Matching of Service and Network in Mobile Communications

Abstract:
In order to support the booming capacity requirements for the next generation mobile communication system, Heterogeneous Ultradense Network (HUDN) is believed as a promising solution. The corresponding standardisation and filed deployments of HDN have been conducted. But the lower energy efficiency and severer interferences caused by densely deployed Base Stations are still the two main obstacles for HUDNs. This talk addresses on above challenges and proposes Active Offloading strategy with collaboration communications to improve the system energy efficiency and decrease interferences. We also research the traffic cell zooming and small cell sleeping based on zooming factor and power consumption. First of all, the transmission power is only considered. In order to minimize transmission power, macro cell users have a trend to offload to macro cell. Shrinking macro cell service coverage, small cell area will expand. And users are served by low power base station and meet the requirement. Then considering base station hardware power and transmission power, small cell should be sleeping to reduce power consumption and achieve green energy. The small cells which serve little users are going to sleep.

Bio:
Chunjing Yuan is currently working toward the Ph.D. degree with School of Information and Communication Engineering at Beijing University of Post and Telecommunications, China. His research interests include active offloading and green communications.

For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Francis Bancroft 3.11

Time and Date: 2 to 3 PM, Wednesday, 21/06/17.

Please keep the dates in your calendar

Any comments, advice would be appreciated.

 Posted by on June 10, 2017
Jun 082017
 

Dear All,

You are cordially invited to the upcoming seminar with details below

Speaker: Prof. Steve Uhlig

Title: Network Measurements as a Hammer in Your Research Toolbox

Abstract:
In this talk, I will share my experience in building a research career, and the role network measurements of different types have played, including traffic traces, server logs, routing information, and DNS measurements. Despite network measurements (both active and passive) being my main hammer to perform research, building a successful research career requires going beyond measurements. Indeed, network measurements are useful for making observations about the Internet, feeding wider research questions, that in turn often ask for more measurements (of different types). For example, initial passive measurements at a strategic location (e.g., a large European IXP) has stimulated questions about the wider ecosystem, some of which can be answered through active measurements crafted to expose this ecosystem, e.g., by mapping the Netflix server infrastructure.

Bio:
Steve Uhlig obtained a Ph.D. degree in Applied Sciences from the University of Louvain, Belgium, in 2004. From 2004 to 2006, he was a Postdoctoral Fellow of the Belgian National Fund for Scientific Research (F.N.R.S.). His thesis won the annual IBM Belgium/F.N.R.S. Computer Science Prize 2005. Between 2004 and 2006, he was a visiting scientist at Intel Research Cambridge, UK, and at the Applied Mathematics Department of University of Adelaide, Australia. Between 2006 and 2008, he was with Delft University of Technology, the Netherlands. Prior to joining Queen Mary University of London, he was a Senior Research Scientist with Technische Universität Berlin/Deutsche Telekom Laboratories, Berlin, Germany.Since January 2012, he is the Professor of Networks and Head of the Networks Research group at Queen Mary, University of London, UK. He was general chair for PAM 2007, general chair for ACM SIGCOMM 2015, PC chair for PAM 2017, and is currently general chair for IMC 2017. He is on the editorial board of IEEE/ACM Transactions on Networking and Elsevier Computer Communications journal. His current research interests are focused on Internet measurements, software-defined networking, and content delivery.

For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Francis Bancroft 1.02.6

Time and Date: 2 to 3 PM, Wednesday, 14/06/17.

Please keep the dates in your calendar

Any comments, advice would be appreciated.

 Posted by on June 8, 2017
May 152017
 

The agenda for the seminar this week is listed below.

Speaker: Jeremiah Onaolapo

Title: A Tale of Leaked Webmail Credentials

Abstract: Account credentials are attractive to cybercriminals who often seek ways to monetize the valuable and sensitive data in the online accounts that such credentials guard. However, it is unclear what exactly cybercriminals do with compromised accounts after gaining access. We built an infrastructure capable of monitoring the activity of cybercriminals that connect to webmail accounts, with the aim of understanding their modus operandi. We also created and instrumented Gmail accounts. In order to lure miscreants into interacting with the accounts, we leaked the associated account credentials on various outlets across the Surface and Dark Webs. We then monitored accesses to the accounts over several months. We observed attempts to evade login anomaly detection systems, and recorded some interesting case studies, including an attempted blackmail attack.

Bio: Jeremiah Onaolapo is a PhD student in the Department of Computer Science at University College London. His research interests include malicious activity in online accounts, social network security, honeypots, online scams, and botnet activity. Prior to his ongoing PhD research, he obtained an MSc qualification in Information Security from UCL in 2014. On the art side of things, he enjoys making pencil sketches.

For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Eng. 216

Time and Date: 2 to 3 PM, Wednesday, 17/05/17.

Any comments, advice would be appreciated.

 Posted by on May 15, 2017
Mar 082017
 

The agenda for the seminar this week is listed below.

Speaker: Dr Shehar Bano

Title: Characterization of Internet Censorship from Multiple Perspectives

Abstract: Censorship of online communications threatens principles of openness and freedom of information on which the Internet was founded. In the interest of transparency and accountability, and more broadly to develop scientific rigour in the field, we need methodologies to measure and characterize Internet censorship. Such studies will not only help users make informed choices about information access, but also illuminate entities involved in or affected by censorship; informing the development of policy and enquiries into the ethics and legality of such practices. However, many issues around Internet censorship remain poorly understood because of the inherently adversarial and opaque landscape in which it operates. As details about mechanisms and targets of censorship are usually undisclosed, it is hard to define exactly what comprises censorship, and how it operates in different contexts.

My research aims to help fill this gap by developing methodologies to derive censorship ground truth using active and passive data analysis techniques, which I apply to real-world datasets to uncover entities involved in censorship, the targets of censorship, and the effects of such practices on different stakeholders. In this talk, I will provide an overview of my work on Internet censorship from multiple perspectives: (i) measurement of the Great Firewall of China that shows that inference of the censor’s traffic analysis model can enable systematic identification of evasion opportunities that users can exploit to access restricted content, (ii) analysis of network logs collected at an Internet Service Provider (ISP) in Pakistan over a period of escalating censorship to study how censorship affects users’ browsing habits with respect to circumvention, and its economic effects on content providers and ISPs, and (iii) investigation of differential treatment — an emerging class of censorship where websites (rather than the government) block requests of users they don’t like — in the context of Tor anonymity network and users of adblocking software.

Bio:
Shehar Bano is a postdoctoral researcher at University College London. Her research interests centre on networked systems, particularly in the context of security and measurement. Currently, she is working on:

- the DECODE platform—a distributed, privacy aware, and trusted architecture based on blockchain technology for decentralized data governance and identity management,

- characterizing churn in the availability of IP addresses and Internet services over time and across different geographic locations in Internet-wide scans,and

- understanding emerging forms of censorship such as conspiracy theories and propaganda in online media.

She completed her Ph.D. from Cambridge under the supervision of Prof. Jon Crowcroft (and co-supervised by Dr. Steven Murdoch, Prof. Vern Paxson, and Prof. Ross Anderson) where she was an Honorary Cambridge Trust Scholar, and was awarded the Mary Bradburn Scholarship by the British Federation of Women Graduates for her research work. Her thesis contributes novel measurement methodologies to identify instances of Internet censorship, and large-scale characterizations of such practices to shed light on how it’s done, how it can be stopped, what its effects are, and the evolving shape of the ecosystem of government/policy-based censorship. Previously she worked on Intrusion Detection Systems, and wrote an open-source software for botnet detection. Her work has been published in the Network and Distributed System Security Symposium, the ACM Internet Measurement Conference, the Symposium on Privacy Enhancing Technologies, and other well-respected venues.
For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Eng. 216

Time and Date: 2 to 3 PM, Wednesday, 12/04/17.

Any comments, advice would be appreciated.

 Posted by on March 8, 2017
Mar 082017
 

The agenda for the seminar this week is listed below.

Speaker: Jie Deng

Title: Internet Scale User-Generated Live Video Streaming: The Twitch Case

Abstract: Twitch is a live video streaming platform used for broadcasting video gameplay, ranging from amateur players to eSports tournaments. This platform has gathered a substantial world wide community, reaching more than 1.7 million broadcasters and 100 million visitors every month. Twitch is fundamentally different from “static” content distribution platforms such as YouTube and Netflix, as streams are generated and consumed in real time. In this paper, we explore the Twitch infrastructure to understand how it manages live streaming delivery to an Internet-wide audience. We found Twitch manages a geo-distributed infrastructure, with presence in four continents. Our findings show that Twitch dynamically allocates servers to channels depending on their popularity. Additionally, we explore the redirection strategy of clients to servers depending on their region and the specific channel.
For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Eng. 216

Time and Date: 2 to 3 PM, Wednesday, 08/03/17.

Any comments, advice would be appreciated.

 Posted by on March 8, 2017
Feb 202017
 

The agenda for the seminar this week is listed below.

Speaker: Dr. Daphne Tuncer

Title: Distributed Resource Management in SDN

Abstract: The Software-Defined Networking (SDN) paradigm is seen as a promising solution to reduce the complexity of network management operations. However designing a SDN-based solution for network resource management raises several challenges as it should exhibit flexibility, scalability and adaptability. In this talk, we will review some of these challenges and present our recent contributions in that direction. After introducing the SDN-based management and control framework that we designed to support both static and dynamic resource management applications, we will discuss issues associated with the exchange of information in distributed management and control scenarios. We will finally demonstrate the benefits of the proposed framework based on two realistic network resource management use cases, namely cache management and security management.

Short bio
Daphne Tuncer is a Research Associate in the Communications and Information Systems Group (CISG), Department of Electronic and Electrical Engineering, University College London (UCL), UK. She obtained her Ph.D. in Electronic and Electrical Engineering from UCL in November 2013. Her research interests are in the areas of software-defined networks (in particular applied to network resource management), cache/content management, adaptive network resource management.
For more details, please go to the link

http://networks.eecs.qmul.ac.uk/category/seminar/

Venue: Eng. 216

Time and Date: 2 to 3 PM, Wednesday, 01/03/17.

Any comments, advice would be appreciated.

 Posted by on February 20, 2017
Feb 172017
 
The agenda for the seminar this week is listed below.
Speaker: Bingyu Xu
Title:  Energy-aware Power Control in Energy-Cooperation Enabled HetNets with Hybrid Energy Supplies
Abstract:
Considers power control in energy-cooperation enabled heterogeneous networks (HetNets), where each base station (BS) is  powered by hybrid energy sources consisting of the conventional power grid and renewable energy sources. Energy can be transferred between BSs with energy loss during the energy transmission process. Transmit power, grid power consumption, and transferred energy are optimized for maximizing the energy efficiency of the whole network. The considered problem is formulated as a non-linear fractional programming problem. To solve it, we propose an energy efficient algorithm, in which the optimal resource allocation policy is obtained by using the lagrangian duality method. Numerical results demonstrate that energy efficiency is substantially improved by using the proposed power control algorithm with energy cooperation, compared with the cases where either power control or energy cooperation are considered.
For more details, please go to the link
http://networks.eecs.qmul.ac.uk/category/seminar/
Venue: Eng. 216
Time and Date: 2 to 3 PM, Wednesday, 22/02/17.
Any comments, advice would be appreciated.
 Posted by on February 17, 2017
Feb 172017
 
The agenda for the seminar this week is listed below.
Speaker: Bizhu Wang
Title:  Wireless SDN based policy consistency and security management under 5G MTC networks
Abstract:
Software-defined-network (SDN) is a promising technology to facilitate the policy update, which will benefit many areas. This project takes E-health monitoring system as an example, aiming to do the policy consistency and security management to guarantee the normal operation when E-health monitoring system is constructed under wireless software-defined-network (SDN). The project is under 5G machine-type-communication (MTC) scenario in which there are massive deployments of wireless devices. Many current policy consistency management technologies rely on modelling the network and reporting to controller to detect and solve the policy conflicts. However, if these schemes are applied in wireless network settings, it will cause huge overheads. And besides, achieving the policy consistency, all of the devices will be involved for signalling forwarding, leading to possibility of information leverage and energy exhaustion. Consulting neighbouring devices to evolve its own flow table and coordinating with security and energy balance scheme could be a potential approach to enhance consistency, energy balance and security for the E-health monitoring system, especially in the MTC scenarios.
For more details, please go to the link
http://networks.eecs.qmul.ac.uk/category/seminar/
Venue: Eng. 216
Time and Date: 2 to 3 PM, Wednesday, 15/02/17.
Any comments, advice would be appreciated.
 Posted by on February 17, 2017