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An efficient privacy-preserving system for monitoring mobile users: Making searchable encryption practical 14

An efficient privacy-preserving system for monitoring mobile...

引用

4th acm conference on data and application security and privacy, CODASPY 2014

作者： Ghinita, Gabriel Rughinis, Razvan University of Massachusetts Boston United States Politehnica University Bucharest Romania

ISBN: (纸本)9781450322782

Monitoring location updates from mobile users has important applications in several areas, ranging from public safety and national security to social networks and advertising. However, sensitive information can be derived from movement patterns, so protecting the privacy of mobile users is a major concern. Users may only be willing to disclose their locations when some condition is met, for instance in proximity of a disaster area, or when an event of interest occurs nearby. Currently, such functionality is achieved using searchable encryption. Such cryptographic primitives provide provable guarantees for privacy, and allow decryption only when the location satisfies some predicate. Nevertheless, they rely on expensive pairing-based cryptography (PBC), and direct application to the domain of location updates leads to impractical solutions. We propose secure and efficient techniques for private processing of location updates that complement the use of PBC and lead to significant gains in performance by reducing the amount of required pairing operations. We also implement two optimizations that further improve performance: materialization of results to expensive mathematical operations, and parallelization. Extensive experimental results show that the proposed techniques significantly improve performance compared to the baseline, and reduce the searchable encryption overhead to a level that is practical in a computing environment with reasonable resources, such as the cloud. Copyright 2014 acm.

关键词： Location

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security of graph data: Hashing schemes and definitions 14

Security of graph data: Hashing schemes and definitions

引用

4th acm conference on data and application security and privacy, CODASPY 2014

作者： Arshad, Muhammad U. Kundu, Ashish Bertino, Elisa Madhavan, Krishna Ghafoor, Arif Purdue University West Lafayette IN United States IBM T J Watson Research Center Yorktown Heights NY United States

ISBN: (纸本)9781450322782

Use of graph-structured data models is on the rise - in graph databases, in representing biological and healthcare data as well as geographical data. In order to secure graph- structured data, and develop cryptographically secure schemes for graph databases, it is essential to formally define and develop suitable collision resistant one-way hashing schemes and show them they are efficient. The widely used Merkle hash technique is not suitable as it is, because graphs may be directed acyclic ones or cyclic ones. In this paper, we are addressing this problem. Our contributions are: (1) define the practical and formal security model of hashing schemes for graphs, (2) define the formal security model of perfectly secure hashing schemes, (3) describe constructions of hashing and perfectly secure hashing of graphs, and (4) performance results for the constructions. Our constructions use graph traversal techniques, and are highly efficient for hashing, redaction, and verification of hashes graphs. We have implemented the proposed schemes, and our performance analysis on both real and synthetic graph data sets support our claims. Copyright 2014 acm.

关键词： Hash functions

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Is it really you? User identification via adaptive behavior fingerprinting 14

Is it really you? User identification via adaptive behavior ...

引用

4th acm conference on data and application security and privacy, CODASPY 2014

作者： Giura, Paul Murynets, Ilona Jover, Roger Piqueras Vahlis, Yevgeniy AT and T Security Research Center New York NY United States Bionym Inc. Toronto ON Canada

ISBN: (纸本)9781450322782

The increased popularity of mobile devices widens opportunities for a user either to lose the device or to have the device stolen and compromised. At the same time, user interaction with a mobile device generates a unique set of features such as dialed numbers, timestamps of communication activities, contacted base stations, etc. This work proposes several methods to identify the user based on her communications history. Specifically, the proposed methods detect an abnormality based on the behavior fingerprint generated by a set of features from the network for each user session. We present an implementation of such methods that use features from real SMS, and voice call records from a major tier 1 cellular operator. This can potentially trigger a rapid reaction upon an unauthorized user gaining control of a lost or stolen terminal, preventing data compromise and device misuse. The proposed solution can also detect background malicious traffic originated by, for example, a malicious application running on the mobile device. Our experiments with annonymized data from 10,000 users, representing over 14 million SMS and voice call detail records, show that the proposed methods are scalable and can continuously identify millions of mobile users while preserving data privacy, and achieving low false positives and high misuse detection rates with low storage and computation overhead. Copyright 2014 acm.

关键词： data privacy

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Android system broadcast actions broadcasts your privacy 21

Android system broadcast actions broadcasts your privacy

引用

21st acm conference on Computer and Communications security, CCS 2014

作者： Mohsen, Fadi Shehab, Mohamed Bello-Ogunu, Emmanuel Al Jarrah, Abeer Department of Software and Information Systems University of North Carolina at Charlotte Charlotte United States

ISBN: (纸本)9781450329576

Android provides finer-grained security features through a "permission" mechanism that puts limitations on the re-sources that each application can access. Upon installing a new Android application, a user is prompted to grant it a set of permissions. There are two typical assumptions made regarding permissions and mobile application security and privacy. The first one is that malicious applications need to retain many permissions. Secondly, mobile devices users assume that installed applications do not access data if they are not in the foreground. In this project, we show that malicious Android applications can still fulfill their objectives with minimum permissions and that they can access user data while in the background. This could happen with the help of another Android component, called broadcast receiver. We study the evaluation of Android broadcast actions. We demonstrate an attack scenario made possible by the broadcast receivers. Moreover, we propose solutions to protect from such attacks. Copyright is held by the owner/author(s).

关键词： Android (operating system)

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Streamforce: Outsourcing access control enforcement for stream data to the clouds 14

Streamforce: Outsourcing access control enforcement for stre...

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4th acm conference on data and application security and privacy, CODASPY 2014

作者： Anh, Dinh Tien Tuan Datta, Anwitaman School of Computing National University of Singapore 13 Computing Drive Singapore Singapore School of Computer Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Singapore

ISBN: (纸本)9781450322782

In this paper, we focus on the problem of data privacy on the cloud, particularly on access controls over stream data. The nature of stream data and the complexity of sharing data make access control a more challenging issue than in traditional archival databases. We present Streamforce - a system allowing data owners to securely outsource their data to an untrusted (curious-but-honest) cloud. The owner specifies fine-grained policies which are enforced by the cloud. The latter performs most of the heavy computations, while learning nothing about the data content. To this end, we employ a number of encryption schemes, including deterministic encryption, proxy-based attribute based encryption and sliding-window encryption. In Streamforce, access control policies are modeled as secure continuous queries, which entails minimal changes to existing stream processing engines, and allows for easy expression of a wide-range of policies. In particular, Streamforce comes with a number of secure query operators including Map, Filter, Join and Aggregate. Finally, we implement Streamforce over an open-source stream processing engine (Esper) and evaluate its performance on a cloud platform. The results demonstrate practical performance for many real-world applications, and although the security overhead is visible, Streamforce is highly scalable. Copyright 2014 acm.

关键词： Access control

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Cassandra: Towards a certifying app store for android 4

Cassandra: Towards a certifying app store for android

引用

4th acm Workshop on security and privacy in Smartphones and Mobile Devices, SPSM 2014, Held in Association with the 21st acm conference on Computer and Communications security, CCS 2014

作者： Lortz, Steffen Mantel, Heiko Starostin, Artem Bähr, Timo Schneider, David Weber, Alexandra Computer Science Department TU Darmstadt Germany

ISBN: (纸本)9781450331555

Modern mobile devices store and process an abundance of data. Although many users consider some of this data as private, they do not yet obtain satisfactory support for con- Trolling what applications might do with their data. In this article, we propose Cassandra, a tool that enables users of mobile devices to check whether Android apps comply with their personal privacy requirements before in- stalling these apps. Beyond this, Cassandra implements the core functionality of a conventional app store, including the browsing of available apps and the delivery of apps for instalation. Cassandra performs the security analysis of apps on a server. However, a user does not need to trust this server be- cause Cassandra employs the proof-carrying code paradigm such that the server's analysis result can be validated on the client. We have proven that Cassandra's security analysis soundly detects all potential information leaks, i.e., allows of information that violate a user's privacy policy. Copyright © 2014 by the Association for Computing Machinery, Inc. (acm).

关键词： application programs

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proceedings of the acm conference on Computer and Communications security

Proceedings of the ACM Conference on Computer and Communicat...

引用

2014 acm Workshop on Information Sharing and Collaborative security, WISCS 2014 - Co-located with CCS 2014

The proceedings contain 9 papers. The topics discussed include: PrefiSec: a distributed alliance framework for collaborative BGP monitoring and prefix-based security;critter: content-rich traffic trace repository;privacy preserving data quality assessment for high-fidelity data sharing;attribute based search in encrypted data;bilateral analysis of information sharing efforts: determining the expected effectiveness of information sharing efforts;taxonomy model for cyber threat intelligence information exchange technologies;on the design of a cyber security data sharing system;data model for android package information and its application to risk analysis system;and secure information and resource sharing in cloud infrastructure as a service.

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Spoilt for choice: Graph-based assessment of key management protocols to share encrypted data 14

Spoilt for choice: Graph-based assessment of key management ...

引用

4th acm conference on data and application security and privacy, CODASPY 2014

作者： Kuehner, Holger Hartenstein, Hannes Karlsruhe Germany

ISBN: (纸本)9781450322782

Sharing data with client-side encryption requires key management. Selecting an appropriate key management protocol for a given scenario is hard, since the interdependency between scenario parameters and the resource consumption of a protocol is often only known for artificial, simplified scenarios. In this paper, we explore the resource consumption of systems that offer sharing of encrypted data within real-world scenarios, which are typically complex and determined by many parameters. For this purpose, we fist collect empirical data that represents real-world scenarios by monitoring large-scale services within our organization. We then use this data to parameterize a resource consumption model that is based on the key graph generated by each key management protocol. The preliminary simulation runs we did so far indicate that this key-graph based model can be used to estimate the resource consumption of real-world systems for sharing encrypted data. Copyright is held by the author/owner(s).

关键词： Cryptography

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SobTrA: A software-based trust anchor for ARM cortex application processors 14

SobTrA: A software-based trust anchor for ARM cortex applica...

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4th acm conference on data and application security and privacy, CODASPY 2014

作者： Horsch, Julian Wessel, Sascha Stumpf, Frederic Eckert, Claudia Fraunhofer AISEC Garching Germany

ISBN: (纸本)9781450322782

In this paper, we present SobTrA, a Software-based Trust Anchor for ARM Cortex-A processors to protect systems against software-based attacks. SobTrA enables the implementation of a software-based secure boot controlled by a third party independent from the manufacturer. Compared to hardware-based trust anchors, our concept provides some other advantages like being updateable and also usable on legacy hardware. The presented software-based trust anchor involves a trusted third party device, the verifler, locally connected to the untrusted device, e.g., via the microSD card slot of a smartphone. The verifler is verifying the integrity of the untrusted device by making sure that a piece of code is executed untampered on it using a timing-based approach. This code can then act as an anchor for a chain of trust similar to a hardware-based secure boot. Tests on our prototype showed that tampered and untampered execution of SobTrA can be clearly and reliably distinguished. Copyright 2014 acm.

关键词： Smartphones

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Oblivious evaluation of non-deterministic finite automata with application to privacy-preserving virus genome detection 13

Oblivious evaluation of non-deterministic finite automata wi...

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13th Workshop on privacy in the Electronic Society, WPES 2014, in Conjunction with the acm conference on Computer and Communications security, acm CCS 2014

作者： Sasakawa, Hirohito Harada, Hiroki Du Verle, David A. Arimura, Hiroki Tsuda, Koji Sakuma, Jun Hokkaido University Japan University of Tsukuba JST Japan University of Tokyo AIST JST Japan

ISBN: (纸本)9781450331487

Various string matching problems can be solved by means of a deterministic finite automaton (DFA) or a non-deterministic finite automaton (NFA). In non-oblivious cases, DFAs are often preferred for their run-time efficiency despite larger sizes. In oblivious cases, however, the inevitable computation and communication costs associated with the automaton size are more favorable to NFAs. We propose oblivious protocols for NFA evaluation based on homomorphic encryption and demonstrate that our method can be orders of magnitude faster than DFA-based methods, making it applicable to real-life scenarios, such as privacy-preserving detection of viral infection using genomic data. Copyright © 2014 acm.

关键词： Genes

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