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TrustSplit: Usable confidentiality for social network messaging 12

TrustSplit: Usable confidentiality for social network messag...

引用

23rd ACM Conference on Hypertext and Social Media, HT'12

作者： Fahl, Sascha Harbach, Marian Muders, Thomas Smith, Matthew Leibniz University of Hannover Distributed Computing and Security Group Hannover Germany

ISBN: (纸本)9781450313353

It is well known that online social networking sites (OSNs) such as Facebook pose risks to their users' privacy. OSNs store vast amounts of users' private data and activities and therefore subject the user to the risk of undesired disclosure. The regular non tech-savvy Facebook user either has little awareness of his privacy needs or is not willing or capable to invest much extra effort into securing his online activities. In this paper, we present a non-disruptive and easy to-use service that helps to protect users' most private information, namely their private messages and chats against the OSN provider itself and external adversaries. Our novel Confidentiality as a Service paradigm was designed with usability and non-obtrusiveness in mind and requires little to no additional knowledge on the part of the users. The simplicity of the service is achieved through a novel trust splitting approach integrated into the Confidentiality as a Service paradigm. To show the feasibility of our approach we present a fully-working prototype for Facebook and an initial usability study. All of the participating subjects completed the study successfully without any problems or errors and only required three minutes on average for the entire installation and setup procedure. Copyright 2012 ACM.

关键词： Social networking (online)

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All our messages are belong to us: Usable confidentiality in social networks

All our messages are belong to us: Usable confidentiality in...

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21st Annual Conference on World Wide Web, WWW'12

作者： Harbach, Marian Fahl, Sascha Muders, Thomas Smith, Matthew Distributed Computing and Security Group Leibniz University of Hannover Hannover Germany

ISBN: (纸本)9781450312301

Current online social networking (OSN) sites pose severe risks to their users' privacy. Facebook in particular is capturing more and more of a user's past activities, sometimes starting from the day of birth. Instead of transiently passing on information between friends, a user's data is stored persistently and therefore subject to the risk of undesired disclosure. Traditionally, a regular user of a social network has little awareness of her privacy needs in the Web or is not ready to invest a considerable effort in securing her online activities. Furthermore, the centralised nature of proprietary social networking platforms simply does not cater for end-to-end privacy protection mechanisms. In this paper, we present a non-disruptive and lightweight integration of a confidentiality mechanism into OSNs. Additionally, direct integration of visual security indicators into the OSN UI raise the awareness for (un)protected content and thus their own privacy. We present a fully-working prototype for Facebook and an initial usability study, showing that, on average, untrained users can be ready to use the service in three minutes. Copyright is held by the author/owner(s).

关键词： Data privacy

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Practical applications of homomorphic encryption

Practical applications of homomorphic encryption

引用

International Conference on security and Cryptography, SECRYPT 2012

作者： Brenner, Michael Perl, Henning Smith, Matthew Distributed Computing Security Group Leibniz Universitt Hannover Hannover Germany

ISBN: (纸本)9789898565242

Homomorphic cryptography has been one of the most interesting topics of mathematics and computer security since Gentry presented the first construction of a fully homomorphic encryption (FHE) scheme in 2009. Since then, a number of different schemes have been found, that follow the approach of bootstrapping a fully homomorphic scheme from a somewhat homomorphic foundation. All existing implementations of these systems clearly proved, that fully homomorphic encryption is not yet practical, due to significant performance limitations. However, there are many applications in the area of secure methods for cloud computing, distributed computing and delegation of computation in general, that can be implemented with homomorphic encryption schemes of limited depth. We discuss a simple algebraically homomorphic scheme over the integers that is based on the factorization of an approximate semiprime integer. We analyze the properties of the scheme and provide a couple of known protocols that can be implemented with it. We also provide a detailed discussion on searching with encrypted search terms and present implementations and performance figures for the solutions discussed in this paper.

关键词： distributed computer systems

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Rethinking SSL development in an appified world 13

Rethinking SSL development in an appified world

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2013 ACM SIGSAC Conference on Computer and Communications security, CCS 2013

作者： Fahl, Sascha Harbach, Marian Perl, Henning Koetter, Markus Smith, Matthew Distributed Computing and Security Group Leibniz University Hannover Hannover Germany

ISBN: (纸本)9781450324779

The Secure Sockets Layer (SSL) is widely used to secure data transfers on the Internet. Previous studies have shown that the state of non-browser SSL code is catastrophic across a large variety of desktop applications and libraries as well as a large selection of Android apps, leaving users vulnerable to Man-in-the-Middle attacks (MITMAs). To determine possible causes of SSL problems on all major appified platforms, we extended the analysis to the walled-garden ecosystem of iOS, analyzed software developer forums and conducted interviews with developers of vulnerable apps. Our results show that the root causes are not simply careless developers, but also limitations and issues of the current SSL development paradigm. Based on our findings, we derive a proposal to rethink the handling of SSL in the appified world and present a set of countermeasures to improve the handling of SSL using Android as a blueprint for other platforms. Our countermeasures prevent developers from willfully or accidentally breaking SSL certificate validation, offer support for extended features such as SSL Pinning and different SSL validation infrastructures, and protect users. We evaluated our solution against 13,500 popular Android apps and conducted developer interviews to judge the acceptance of our approach and found that our solution works well for all investigated apps and developers. © 2013 ACM.

关键词： Android (operating system)

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Hey, you, get off of my clipboard: On how usability trumps security in android password managers

Hey, you, get off of my clipboard: On how usability trumps s...

引用

17th International Conference on Financial Cryptography and Data security, FC 2013

作者： Fahl, Sascha Harbach, Marian Oltrogge, Marten Muders, Thomas Smith, Matthew Distributed Computing and Security Group Leibniz University of Hannover Hannover Germany

ISBN: (纸本)9783642398834

Password managers aim to help users manage their ever increasing number of passwords for online authentication. Since users only have to memorise one master secret to unlock an encrypted password database or key chain storing all their (hopefully) different and strong passwords, password managers are intended to increase username/password security. With mobile Internet usage on the rise, password managers have found their way onto smartphones and tablets. In this paper, we analyse the security of password managers on Android devices. While encryption mechanisms are used to protect credentials, we will show that a usability feature of the investigated mobile password managers puts the users' usernames and passwords at risk. We demonstrate the consequences of our findings by analysing 21 popular free and paid password managers for Android. We then make recommendations how to overcome the current problems and provide an implementation of a secure and usable mobile password manager. © 2013 Springer-Verlag.

关键词： Cryptography

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How practical is homomorphically encrypted program execution? An implementation and performance evaluation

How practical is homomorphically encrypted program execution...

引用

11th IEEE International Conference on Trust, security and Privacy in computing and Communications, TrustCom-2012

作者： Brenner, Michael Perl, Henning Smith, Matthew Distributed Computing Security Group Leibniz Universität Hannover Germany

ISBN: (纸本)9780769547459

Homomorphic cryptography has received a lot of attention due to potentially ground breaking advances in cryptography. However it is also surrounded by a lot of hyperbole such as "ground breaking advances", "this will solve all Cloud computing problems" to "it is completely impractical" and "it will never work for real world problems". In previous work we showed how homomorphic encryption can be used to execute arbitrary programs in encrypted space, showing that at least in theory real world problems can be computed protected by homomorphic cryptography without losing generality. In this paper we expand our work to evaluate how practical current homomorphic cryptography based on the Smart-Vercauteren system is for executing arbitrary programs on untrusted resources. For this we present the implementation of a method to compute non-linear secret programs on an untrusted resource using encrypted circuits embedded in an encrypted virtual machine. We successively show how a processor architecture using encrypted circuits can be implemented so it can support read and write memory access, dynamic parameters and non-linear programs that render branch-decisions at runtime. The system comprises the runtime environment for program execution and an assembler to generate the encrypted machine code. We present performance evaluation of the sub-components as well as the complete system. The system represents a flexible prototype for homomorphic program execution in software and system architecture. © 2012 IEEE.

关键词： Cryptography

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Mobile evil twin malnets - The worst of both worlds

Mobile evil twin malnets - The worst of both worlds

引用

11th International Conference on Cryptology and Network security, CANS 2012

作者： Szongott, Christian Henne, Benjamin Smith, Matthew Distributed Computing and Security Group Gottfried Wilhelm Leibniz University of Hannover Germany

ISBN: (纸本)9783642354038

The mobile computing world is undergoing major changes both in the capability as well as in the proliferation of mobile devices. While, up to now, mobile malware has played a relatively small role compared to the behemoth of desktop malware, the changing environment is steadily increasing the attractiveness of mobile devices as exploitable resources. The increased usage and connectivity of mobile devices opens up a much larger set of attack vectors to compromise them. In this paper, we adapt the evil twin rogue access point attack to the mobile domain and show how it can be used to create a mobile malnet, which is capable of spreading epidemically. We implemented the key components of the concept for the iPhone to study its properties in a laboratory environment. To demonstrate the dangers which come along with this kind of attack we simulate a metropolitan area and show how fast a malware can spread in a mobile environment. © Springer-Verlag 2012.

关键词： Malware

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Towards a mobile security & privacy simulator

Towards a mobile security & privacy simulator

引用

2nd IEEE International Conference on Open Systems, ICOS 2011

作者： Henne, Benjamin Szongott, Christian Smith, Matthew Distributed Computing and Security Group Leibniz Universität Hannover Hannover Germany

ISBN: (纸本)9781612849317

The proliferation and capabilities of mobile, networked devices is increasing rapidly and with this trend new threats to security and privacy are emerging at an alarming rate. The new threats are difficult to study and prepare for, since field studies are costly, limited in scope and have significant security and privacy issues of their own. In this paper, we present a Mobile security & Privacy Simulator, which enables the simulation of mobile entities and their environment to study security and privacy related issues. Entities act and interact with one another, influenced by personal and world context. Simulation can be used to evaluate privacy threats and countermeasures by numerical analysis and by visualization to better grasp the implications of new devices, services and the threats against them. We also present a brief study on the effects of mono-culture in mobile operating systems when faced with the epidemic spread of mobile malware, which shows how future mobile networks can reach total infection within a short time. © 2011 IEEE.

关键词： Mobile security

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Evaluating the threat of epidemic mobile malware

Evaluating the threat of epidemic mobile malware

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2012 IEEE 8th International Conference on Wireless and Mobile computing, Networking and Communications, WiMob 2012

作者： Szongott, Christian Henne, Benjamin Smith, Matthew Distributed Computing and Security Group Gottfried Wilhelm Leibniz University of Hannover Germany

ISBN: (纸本)9781467314305

While mobile malware has played a relatively small role compared to the behemoth of desktop malware, the changes both in the capability as well as in the proliferation of the mobile devices will steadily increase the attractiveness of mobile devices as resources to be attacked. The increased usage and connectivity of mobile devices opens up a much larger set of attack vectors to compromise these devices. In this paper, we discuss how the new features of mobile devices opens up the capability to create a new generation of mobile malware which is capable of realistically spreading epidemically on a fully mobile infection vector. We present a prototype of such a mobile malware that uses these features to replicate itself and spread over a mobile device-to-device vector. Using simulations we give quantitative support for the number of mobile devices and conditions needed to for an epidemic spread of mobile malware and present infection scenarios in downtown Chicago. Our results show that the recent growth and market dominance of just a handful of mobile phone companies and the trend towards mobile operating systems monoculture has already created a viable substrate for epidemic mobile malware. © 2012 IEEE.

关键词： Malware

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SnapMe if you can: Privacy threats of other peoples' geo-tagged media and what we can do about it 13

SnapMe if you can: Privacy threats of other peoples' geo-tag...

引用

6th ACM Conference on security and Privacy in Wireless and Mobile Networks, WiSec 2013

作者： Henne, Benjamin Szongott, Christian Smith, Matthew Distributed Computing and Security Group Leibniz Universität Hannover Hannover Germany

ISBN: (纸本)9781450319980

The amount of media uploaded to the Web is still rapidly expanding. The ease-of-use of modern smartphones in combination with the proliferation of high-speed mobile networks facilitates a culture of spontaneous and often carefree sharing of user-generated content, especially photos and videos. An increasing number of modern devices are capable of embedding location information and other metadata into created content. However, currently there is not much user awareness of possible privacy consequences of such data. While in most cases users upload their own media consciously, the flood of media uploaded by others is so huge that it is almost impossible for users to stay aware of all media that might be relevant to them. Current social network services and photo-sharing sites mainly focus on the privacy of users' own media in terms of access control, but offer few possibilities to deal with privacy implications created by other users' actions. We conducted an online survey with 414 participants. The results show that users would like to get more information about media shared by others. Based on an analysis of prevalent sharing services like Flickr, Facebook, or Google+ and an analysis of metadata of three different sets of crawled photos, we discuss privacy implications and potentials of the emerging trend of (geo-)tagged media. Finally, we present a novel concept on how location information can actually help users to control the flood of potentially infringing or interesting media. Copyright 2013 ACM.

关键词： Metadata

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