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Short paper: Location privacy: User behavior in the field

Short paper: Location privacy: User behavior in the field

引用

2nd acm Workshop on security and privacy in Smartphones and Mobile Devices, SPSM 2012

作者： Fisher, Drew Dorner, Leah Wagner, David Department of Electrical Engineering and Computer Science University of California Berkeley Berkeley CA 94720-1776 United States

ISBN: (纸本)9781450316668

Current smartphone platforms provide ways for users to control access to information about their location. For instance, on the iPhone, when an application requests access to location information, the operating system asks the user whether to grant location access to this application. In this paper, we study how users are using these controls. Do iPhone users allow applications to access their location? Do their decisions differ from application to application? Can we predict how a user will respond for a particular application, given their past responses for other applications? We gather data from iPhone users that sheds new light on these questions. Our results indicate that there are different classes of users: some deny all applications access to their location, some allow all applications access to their location, and some selectively permit a fraction of their applications to access their location. We also find that apps can be separated into different classes by what fraction of users trust the app with their location data. Finally, we investigate using machine learning techniques to predict users' location-sharing decisions;we find that we are sometimes able to predict the user's actual choice, though there is considerable room for improvement. If it is possible to improve the accuracy rate further, this information could be used to relieve users of the cognitive burden of individually assigning location permissions for each application, allowing users to focus their attention on more critical matters.

关键词： Smartphones

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Cachet: A decentralized architecture for privacy preserving social networking with caching 12

Cachet: A decentralized architecture for privacy preserving ...

引用

8th acm International conference on Emerging Networking EXperiments and Technologies, CoNEXT 2012

作者： Nilizadeh, Shirin Jahid, Sonia Mittal, Prateek Borisov, Nikita Kapadia, Apu Indiana University Bloomington United States University of Illinois Urbana-Champaign United States University of California Berkeley United States

ISBN: (纸本)9781450317757

Online social networks (OSNs) such as Facebook and Google+ have transformed the way our society communicates. However, this success has come at the cost of user privacy;in today's OSNs, users are not in control of their own data, and depend on OSN operators to enforce access control policies. A multitude of privacy breaches has spurred research into privacy-preserving alternatives for social networking, exploring a number of techniques for storing, disseminating, and controlling access to data in a decentralized fashion. In this paper, we argue that a combination of techniques is necessary to efficiently support the complex functionality requirements of OSNs. We propose Cachet, an architecture that provides strong security and privacy guarantees while preserving the main functionality of online social networks. In particular, Cachet protects the confidentiality, integrity and availability of user content, as well as the privacy of user relationships. Cachet uses a distributed pool of nodes to store user data and ensure availability. Storage nodes in Cachet are untrusted;we leverage cryptographic techniques such as attribute-based encryption to protect the confidentiality of data. For efficient dissemination and retrieval of data, Cachet uses a hybrid structured-unstructured overlay paradigm in which a conventional distributed hash table is augmented with social links between users. Social contacts in our system act as caches to store recent updates in the social network, and help reduce the cryptographic as well as the communication overhead in the network. We built a prototype implementation of Cachet in the FreePastry simulator. To demonstrate the functionality of existing OSNs we implemented the 'newsfeed' application. Our evaluation demonstrates that (a) decentralized architectures for privacy preserving social networking are feasible, and (b) use of social contacts for object caching results in significant performance improvements. © 2012 acm.

关键词： Social networking (online)

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Understanding and improving app installation security mechanisms through empirical analysis of android

Understanding and improving app installation security mechan...

引用

2nd acm Workshop on security and privacy in Smartphones and Mobile Devices, SPSM 2012

作者： Barrera, David Clark, Jeremy McCarney, Daniel Van Oorschot, Paul C. School of Computer Science Carleton University Canada

ISBN: (纸本)9781450316668

We provide a detailed analysis of two largely unexplored aspects of the security decisions made by the Android op-erating system during the app installation process: update integrity and UID assignment. To inform our analysis, we collect a dataset of Android application metadata and ex-tract features from these binaries to gain a better under-standing of how developers interact with the security mech-anisms invoked during installation. Using the dataset, we find empirical evidence that Android's current signing ar-chitecture does not encourage best security practices. We also find that limitations of Android's UID sharing method force developers to write custom code rather than rely on OS-level mechanisms for secure data transfer between apps. As a result of our analysis, we recommend incrementally de-ployable improvements, including a novel UID sharing mech-anism with applicability to signature-level permissions. We additionally discuss mitigation options for a security bug in Google's Play store, which allows apps to transparently obtain more privileges than those requested in the manifest.

关键词： application programs

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CODASPY'11 - proceedings of the 1st acm conference on data and application security and privacy

CODASPY'11 - Proceedings of the 1st ACM Conference on Data a...

引用

1st acm conference on data and application security and privacy, CODASPY'11

ISBN: (纸本)9781450304665

The proceedings contain 27 papers. The topics discussed include: distributed data usage control for web applications: a social network implementation;MyABDAC: compiling XacmL policies for attribute-based database access control;implementation and performance evaluation of privacy-preserving fair reconciliation protocols on ordered sets;an empirical assessment of approaches to distributed enforcement in role-based access control (RBAC);a language for provenance access control;non-interactive editable signatures for assured data provenance;identifying a critical threat to privacy through automatic image classification;k-out-of-n oblivious transfer based on homomorphic encryption and solvability of linear equations;mixture of gaussian models and bayes error under differential privacy;relationship-based access control: protection model and policy language;and enforcing physically restricted access control for remote data.

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Risk-based security decisions under uncertainty 12

Risk-based security decisions under uncertainty

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2nd acm conference on data and application security and privacy, CODASPY'12

作者： Molloy, Ian Dickens, Luke Morisset, Charles Cheng, Pau-Chen Lobo, Jorge Russo, Alessandra Ibm Research Tj Watson HawthorneNY United States Imperial College London United Kingdom Security Group IIT-CNR Pisa Italy

ISBN: (纸本)9781450310918

This paper addresses the making of security decisions, such as access-control decisions or spam filtering decisions, under uncertainty, when the benefit of doing so outweighs the need to absolutely guarantee these decisions are correct. For instance, when there are limited, costly, or failed communication channels to a policy-decision-point. Previously, local caching of decisions has been proposed, but when a correct decision is not available, either a policy-decision-point must be contacted, or a default decision used. We improve upon this model by using learned classifiers of access control decisions. These classifiers, trained on known decisions, infer decisions when an exact match has not been cached, and uses intuitive notions of utility, damage and uncertainty to determine when an inferred decision is preferred over contacting a remote PDP. Clearly there is uncertainty in the predicted decisions, introducing a degree of risk. Our solution proposes a mechanism to quantify the uncertainty of these decisions and allows administrators to bound the overall risk posture of the system. The learning component continuously refines its models based on inputs from a central policy server in cases where the risk is too high or there is too much uncertainty. We have validated our models by building a prototype system and evaluating it with requests from real access control policies. Our experiments show that over a range of system parameters, it is feasible to use machine learning methods to infer access control policies decisions. Thus our system yields several benefits, including reduced calls to the PDP, reducing latency and communication costs;increased net utility;and increased system survivability. © 2012 acm.

关键词： Access control

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CODASPY'11 - proceedings of the 1st acm conference on data and application security and privacy: Foreword

CODASPY'11 - Proceedings of the 1st ACM Conference on Data a...

引用

CODASPY'11 - proceedings of the 1st acm conference on data and application security and privacy 2011年 iii页

作者： Sandhu, Ravi Bertino, Elisa University of Texas San Antonio United States Purdue University United States

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The challenge of data and application security and privacy (DASPY)

The challenge of data and application security and privacy (...

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1st acm conference on data and application security and privacy, CODASPY'11

作者： Sandhu, Ravi Institute for Cyber Security University of Texas San Antonio TX United States

This talk gives a personal perspective on the topic area of this new conference on data and application security and privacy, the difficult nature of the challenge we are confronting and possible research thrusts that... 详细信息

ISBN: (纸本)9781450304665

关键词： data privacy

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"These Aren't the Droids You're Looking For": Retrofitting Android to Protect data from Imperious applications 11

"These Aren't the Droids You're Looking For": Retrofitting A...

引用

18th acm conference on Computer and Communications security (CCS)

作者： Hornyack, Peter Han, Seungyeop Jung, Jaeyeon Schechter, Stuart Wetherall, David Univ Washington Seattle WA 98195 USA Microsoft Res Redwood City CA USA

ISBN: (纸本)9781450310758

We examine two privacy controls for Android smartphones that empower users to run permission-hungry applications while protecting private data from being exfiltrated: (1) covertly substituting shadow data in place of data that the user wants to keep private, and (2) blocking network transmissions that contain data the user made available to the application for on-device use only. We retrofit the Android operating system to implement these two controls for use with unmodified applications. A key challenge of imposing shadowing and exfiltration blocking on existing applications is that these controls could cause side effects that interfere with user-desired functionality. To measure the impact of side effects, we develop an automated testing methodology that records screenshots of application executions both with and without privacy controls, then automatically highlights the visual differences between the different executions. We evaluate our privacy controls on 50 applications from the Android Market, selected from those that were both popular and permission-hungry. We find that our privacy controls can successfully reduce the effective permissions of the application without causing side effects for 66% of the tested applications. The remaining 34% of applications implemented user-desired functionality that required violating the privacy requirements our controls were designed to enforce;there was an unavoidable choice between privacy and user-desired functionality.

关键词： smartphone privacy android

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Research agenda for data and application security

Research agenda for data and application security

引用

1st acm conference on data and application security and privacy, CODASPY'11

作者： Wang, X. Sean National Science Foundation University of Vermont Arlington VA United States

ISBN: (纸本)9781450304665

data and application security is traditionally viewed as a subfield of cybersecurity. The goal is still the same, namely to provide trustworthy computing infrastructure. However, in data and application security, we are dealing with the infrastructural aspects that are closer to humans, their interactions with the system, their perceptions, and their values. data should not be treated as just bits, but as semantically rich content. Hence, securing data may be different from securing bits. application software is much more diverse than system software, often directly responding to particular end-user needs. Hence, usability of security may be of more importance. The above may be just a small sample of the uniqueness of data and application security. What else? What particular research agenda does this uniqueness call for? What about research methodologies? With the above questions in mind, this panel will bring 4-5 panelists to discuss their experiences and their views of future research directions in data and application security. Copyright 2011 acm.

关键词： application programs

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Key dependent message security: Recent results and applications 11

Key dependent message security: Recent results and applicati...

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1st acm conference on data and application security and privacy, CODASPY'11

作者： Malkin, Tal Teranishi, Isamu Yung, Moti Columbia University New York NY United States NEC Corporation Columbia University United States Google Inc. Columbia University United States

ISBN: (纸本)9781450304665

An encryption scheme is Key Dependent Message (KDM) secure if it is secure even against an attacker who has access to encryptions of messages which depend on the secret key. Recent studies have revealed that this strong security notion is important both theoretically and practically. In this paper we review the defnition, and survey recent results and applications of KDM security. Copyright 2011 acm.

关键词： Surveys

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