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检索条件"任意字段=Proceedings of the Twelfth ACM Conference on Data and Application Security and Privacy"

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Rapid screening of transformed data leaks with efficient algorithms and parallel computing 15

Rapid screening of transformed data leaks with efficient alg...

引用

5th acm conference on data and application security and privacy, CODASPY 2015

作者： Shu, Xiaokui Zhang, Jing Yao, Danfeng Daphne Feng, Wu-Chun Department of Computer Science Virginia Tech BlacksburgVA United States

ISBN: (纸本)9781450331913

The leak of sensitive data on computer systems poses a seri- ous threat to organizational security. Organizations need to identify the exposure of sensitive data by screening the con- tent in storage and transmission, i.e., to detect sensitive in- formation being stored or transmitted in the clear. However, detecting the exposure of sensitive information is challenging due to data transformation in the content. Transformations (such as insertion, deletion) result in highly unpredictable leak patterns. Existing automata-based string matching algorithms are impractical for detecting transformed data leaks, because of its formidable complexity when model- ing the required regular expressions. We design two new algorithms for detecting long and transformed data leaks. Our system achieves high detection accuracy in recogniz- ing transformed leaks compared to the state-of-the-art in- spection methods. We parallelize our prototype on graphics processing unit and demonstrate the strong scalability of our detection solution required by a sizable organization. Copyright © 2015 acm.

关键词： Sensitive data

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CryptStream: Cryptographic access controls for streaming data 15

CryptStream: Cryptographic access controls for streaming dat...

引用

5th acm conference on data and application security and privacy, CODASPY 2015

作者： Thoma, Cory Lee, Adam J. Labrinidis, Alexandros University of Pittsburgh PittsburghPA15260 United States

ISBN: (纸本)9781450331913

With data becoming available in larger quantities and at higher rates, new data processing paradigms have been pro- posed to handle large and fast data. data Stream Processing is one such paradigm wherein transient data ows as streams through sets of continuous queries, only returning results when data is of interest to the querier, allowing uninterest- ing data to be ignored. To process these data streams, users are employing third party computational platforms or large private platforms to reduce the individual cost for querying and computing over data streams. Utilizing third parties for outsourcing computation means data being processed is available to the third party as well, which could violate the data provider's privacy. There has been research done into access control for streaming data, and these works provide a good first step, but fall short of a complete system. In this paper, we introduce CryptStream for cryptographically enforcing access controls over streaming data. CryptStream combines data providers access control policies with ones prescribed by the data consumer and the server as well. We show that CryptStream improves over earlier work in the same design space while providing smaller overheads and more flexibility. Copyright © 2015 acm.

关键词： Access control

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DEMO: NFCGate - An NFC relay application for android 8

DEMO: NFCGate - An NFC relay application for android

引用

8th acm conference on security and privacy in Wireless and Mobile Networks, WiSec 2015

作者： Maass, Max Müller, Uwe Schons, Tom Wegemer, Daniel Schulz, Matthias Secure Mobile Networking Lab. Technische Universität Darmstadt Darmstadt Germany

ISBN: (纸本)9781450336239

Near Field Communication (NFC) is a technology widely used for security-critical applications like access control or payment systems. Many of these systems rely on the security assumption that the card has to be in close proximity to communicate with the reader. We developed NFCGate, an Android application capable of relaying NFC communication between card and reader using two rooted but otherwise unmodified Android phones. This enables us to increase the distance between card and reader, eavesdrop on, and even modify the exchanged data. The application should work for any system built on top of ISO 14443-3 that is not hardened against relay attacks, and was successfully tested with a popular contactless card payment system and an electronic passport document.

关键词： Android Near Field Communication Relay attack

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CODASPY 2014 - proceedings of the 4th acm conference on data and application security and privacy

CODASPY 2014 - Proceedings of the 4th ACM Conference on Data...

引用

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

ISBN: (纸本)9781450322782

The proceedings contain 41 papers. The topics discussed include: on the suitability of dissemination-centric access control systems for group-centric sharing;Streamforce: outsourcing access control enforcement for stream data to the clouds;automated black-box detection of access control vulnerabilities in web applications;PhishSafe: leveraging modern Javascript API's for transparent and robust protection;COMPARS: toward an empirical approach for comparing the resilience of reputation systems;situational awareness through reasoning on network incidents;measuring the robustness of source program obfuscation: studying the impact of compiler optimizations on the obfuscation of C programs;interaction provenance model for unified authentication factors in service oriented computing;POSTER: a pairing-free certificateless hybrid signcryption scheme for advanced metering infrastructures;and DIVILAR: diversifying intermediate language for anti-repackaging on Android platform.

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Can't you hear me knocking: Identification of user actions on android apps via traffic analysis 15

Can't you hear me knocking: Identification of user actions o...

引用

5th acm conference on data and application security and privacy, CODASPY 2015

作者： Conti, Mauro Mancini, Luigi V. Spolaor, Riccardo Verde, Nino V. University of Padua Padua Italy Sapienza University of Rome Rome Italy

ISBN: (纸本)9781450331913

While smartphone usage become more and more pervasive, people start also asking to which extent such devices can be maliciously exploited as "tracking devices". The concern is not only related to an adversary taking physical or remote control of the device, but also to what a passive adversary without the above capabilities can observe from the device communications. Work in this latter direction aimed, for example, at inferring the apps a user has installed on his device, or identifying the presence of a specific user within a network. In this paper, we move a step forward: we investigate to which extent it is feasible to identify the specific actions that a user is doing on mobile apps, by eavesdropping their encrypted network traffic. We design a system that achieves this goal by using advanced machine learning techniques. We did a complete implementation of this system and run a thorough set of experiments, which show that it can achieve accuracy and precision higher than 95% for most of the considered actions. Copyright © 2015 acm.

关键词： Mobile security

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StaDynA: Addressing the problem of dynamic code updates in the security analysis of android applications 15

StaDynA: Addressing the problem of dynamic code updates in t...

引用

5th acm conference on data and application security and privacy, CODASPY 2015

作者： Zhauniarovich, Yury Ahmad, Maqsood Gadyatskaya, Olga Crispo, Bruno Massacci, Fabio University of Trento Trento Italy SnT University of Luxembourg Luxembourg Luxembourg DistriNet KU Leuven Leuven Belgium

ISBN: (纸本)9781450331913

Static analysis of Android applications can be hindered by the presence of the popular dynamic code update techniques: dynamic class loading and reflection. Recent Android mal- ware samples do actually use these mechanisms to conceal their malicious behavior from static analyzers. These tech- niques defuse even the most recent static analyzers (e.g., [12, 21, 31]) that usually operate under the "closed world" assumption (the targets of reflective calls can be resolved at analysis time;only classes reachable from the class path at analysis time are used at runtime). Our proposed solution allows existing static analyzers to remove this assumption. This is achieved by combining static and dynamic analysis of applications in order to reveal the hidden/updated behav- ior and extend static analysis results with this information. This paper presents design, implementation and preliminary evaluation results of our solution called StaDynA. Copyright © 2015 acm.

关键词： Static analysis

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Tunably-oblivious memory: Generalizing ORAM to enable privacy-efficiency tradeoffs 15

Tunably-oblivious memory: Generalizing ORAM to enable privac...

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5th acm conference on data and application security and privacy, CODASPY 2015

作者： Dautrich, Jonathan Ravishankar, Chinya Google Inc. IrvineCA United States Computer Science and Engineering University of California Riverside United States

ISBN: (纸本)9781450331913

We consider the challenge of providing privacy-preserving access to data outsourced to an untrusted cloud provider. Even if data blocks are encrypted, access patterns may leak valuable information. Oblivious RAM (ORAM) protocols guarantee full access pattern privacy, but even the most efficient ORAMs to date require roughly l log2 N block transfers to satisfy an l-block query, for block store capacity N. We propose a generalized form of ORAM called Tunably- Oblivious Memory (λ-TOM) that allows a query's public access pattern to assume any of λ possible lengths. Increasing λ yields improved efficiency at the cost of weaker privacy guarantees. 1-TOM protocols are as secure as ORAM. We also propose a novel, special-purpose TOM protocol called Staggered-Bin TOM (SBT), which efficiently handles large queries that are not cache-friendly. We also propose a read-only SBT variant called Multi-SBT that can satisfy such queries with only O(l + logN) block transfers in the best case, and only O(l logN) transfers in the worst case, while leaking only O(log log logN) bits of information per query. Our experiments show that for N = 224 blocks, Multi-SBT achieves practical bandwidth costs as low as 6X those of an unprotected protocol for large queries, while leaking at most 3 bits of information per query. Copyright © 2015 acm.

关键词： Random access storage

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Dimensions of risk in mobile applications: A user study 15

Dimensions of risk in mobile applications: A user study

引用

5th acm conference on data and application security and privacy, CODASPY 2015

作者： Jorgensen, Zach Chen, Jing Gates, Christopher S. Li, Ninghui Proctor, Robert W. Yu, Ting Department of Computer Science North Carolina State University RaleighNC United States Department of Psychological Sciences CERIAS Purdue University West LafayetteIN United States Department of Computer Science CERIAS Purdue University West LafayetteIN United States Qatar Computing Research Institute Doha Qatar

ISBN: (纸本)9781450331913

Mobile platforms, such as Android, warn users about the permissions an app requests and trust that the user will make the correct decision about whether or not to install the app. Unfortunately many users either ignore the warning or fail to understand the permissions and the risks they imply. As a step toward developing an indicator of risk that decomposes risk into several categories, or dimensions, we conducted two studies designed to assess the dimensions of risk deemed most important by experts and novices. In Study 1, semi-structured interviews were conducted with 19 security experts, who also performed a card sorting task in which they categorized permissions. The experts identified three major risk dimensions in the interviews (personal information privacy, monetary risk, and device availability/ stability), and a forth dimension (data integrity) in the card sorting task. In Study 2, 350 typical Android users, recruited via Amazon Mechanical Turk, filled out a questionnaire in which they (a) answered questions concerning their mobile device usage, (b) rated how often they considered each of several types of information when installing apps, (c) indicated what they considered to be the biggest risk associated with installing an app on their mobile device, and (d) rated their concerns with regard to specific risk types and about apps having access to specific types of information. In general, the typical users' concerns were similar to those of the security experts. The results of the studies suggest that risk information should be organized into several risk types that can be better understood by users and that a mid-level risk summary should incorporate the dimensions of personal information privacy, monetary risk, device availability/ stability risk and data integrity risk. Copyright © 2015 acm.

关键词： Mobile security

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A Platform for Context-Aware application Development: PCAD

A Platform for Context-Aware Application Development: PCAD

引用

3rd International conference on Innovative Network Systems and applications (iNetSApp) held in conjunction with Federated conference on Computer Science and Information Systems (FedCSIS)

作者： Celikkan, Ufuk Kurtel, Kaan Izmir Univ Econ Dept Software Engn Sakarya Cad 156 TR-35330 Izmir Turkey

ISBN: (纸本)9788360810668

We propose a novel software platform based on the notion of context-awareness which allows rapid and easy development of context aware applications. One of the fundamental goals of the proposed platform is extensibility, allowing the platform to react to new requirements without making fundamental and substantial changes. The Context Aware application Development Platform-PCAD-has inspired from an operating system and modeled as a layered architecture. It exhibits a plug-and-play behavior very similar to devices and device drivers found on an operating system/kernel. The platform offers functions such as data management, notification, security and privacy as services. The platform provides a public interface to application developers in their development of context-aware applications. It covers a wide range of disparate application domains such as smart city and livestock monitoring applications.

关键词： application program interfaces data privacy operating system kernels ubiquitous computing PCAD context aware application development platform data management data notification data security extensibility layered architecture livestock monitoring applications operating system operating system kernel plug-and-play behavior public interface smart city software platform Computer architecture Context Context modeling Context-aware services Operating systems Real-time systems Sensors

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Virtual resource orchestration constraints in cloud infrastructure as a service 15

Virtual resource orchestration constraints in cloud infrastr...

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5th acm conference on data and application security and privacy, CODASPY 2015

作者： Bijon, Khalid Krishnan, Ram Sandhu, Ravi Institute for Cyber Security Univ of Texas at San Antonio United States

ISBN: (纸本)9781450331913

In an infrastructure as a service (IaaS) cloud, virtualized IT resources such as compute, storage and network are offered on demand by a cloud service provider (CSP) to its tenants (customers). A major problem for enterprise-scale tenants that typically obtain significant amount of resources from a CSP concerns orchestrating those resources in a secure manner. For instance, unlike configuring physical hardware, virtual resources in IaaS are configured using software, and hence prone to misconfigurations that can lead to critical security violations. Examples of such resource orchestration operations include creating virtual machines with appropri- ate operating system and software images depending on their purpose, creating networks, connecting virtual machines to networks, attaching a storage volume to a particular virtual machine, etc. In this paper, we propose attribute-based con- straints specification and enforcement as a means to mitigate this issue. High-level constraints specified using attributes of virtual resources prevent resource orchestration operations that can lead to critical misconfigurations. Our model al- lows tenants to customize the attributes of their resources and specify fine-grained constraints. We further propose a constraint mining approach to automatically generate con- straints once the tenants specify the attributes for virtual re- sources. We present our model, enforcement challenges, and its demonstration in OpenStack, the de facto open-source cloud IaaS software. Copyright © 2015 acm.

关键词： Virtual machine

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