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

共 579 条记录，以下是411-420 订阅

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Demo Overview: privacy-Enhancing Features of IdentiDroid 14

Demo Overview: Privacy-Enhancing Features of IdentiDroid

引用

21st acm conference on Computer and Communications security (CCS)

作者： Midi, Daniele Oluwatimi, Oyindamola Shebaro, Bilal Bertino, Elisa Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9781450329576

As privacy today is a major concern for mobile systems, network anonymizers are widely available on smartphones systems, such as Android. However, in many cases applications are still able to identify the user and the device by means different from the IP address. In this demo we show two solutions that address this problem by providing application-level anonymity. The first solution shadows sensitive data that can reveal the user identity. The second solutions dynamically revokes Android application permissions associated with sensitive information at run-time. In addition, both solutions offer protection from applications that identify their users through traces left in the application's data storage or by exchanging identifying data messages. We developed IdentiDroid, a customized Android operating system, to deploy these solutions, and built IdentiDroid Profile Manager, a profile-based configuration tool for setting different configurations for each installed Android application.

关键词： Android IdentiDroid Anonymity Permissions Shadowing

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On quantitative dynamic data flow tracking 14

On quantitative dynamic data flow tracking

引用

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

作者： Lovat, Enrico Oudinet, Johan Pretschner, Alexander Technische Universität München Germany

ISBN: (纸本)9781450322782

We present a non-probabilistic model for dynamic quantitative data flow tracking. Estimations of the amount of data stored in a particular representation at runtime - a file, a window, a network packet - enable the adoption of finegrained policies which authorize or prohibit partial leaks of data. We prove the correctness of the estimations, provide an implementation that we evaluate w.r.t. precision and performance, and analyze one instantiation at the OS level. Copyright is held by the owner/author(s).

关键词： data flow analysis

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Collecting, Analyzing and Responding to Enterprise Scale DNS Events 15

Collecting, Analyzing and Responding to Enterprise Scale DNS...

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proceedings of the 5th acm conference on data and application security and privacy

作者： William Horne Hewlett-Packard Laboratories Princeton NJ USA

ISBN: (纸本)9781450331913

DNS is an important data source for security for many reasons. If the DNS infrastructure can be brought down, many networking tasks would be impossible to complete. If the integrity of the mapping between domain names and IP addresses is compromised, attackers can redirect users undetectably to IP addresses of their choosing. And malware of many types must in one way or another use the DNS infrastructure as part of their operations. For example, botnets often use fast flux techniques and domain name generation algorithms to rendezvous with command and control *** DNS is a significant challenge. In HP, our core internal DNS clusters process approximately 16 billion DNS packets every day. Ideally, we would like to turn each and every one of those packets into an event for our security information and event management (SIEM) system. However, we would have to grow our SIEM, which is one of the largest deployments in the world, by a factor of six to collect this data. Moreover, traditional logging has a substantial performance impact on the DNS infrastructure, and therefore from an operational perspective enabling logging is also impractical. Finally, DNS servers generally do not log the information necessary to detect many security *** deal with these problems we collect and filter this traffic using hardware network packet sniffers, which have no impact on the performance of the DNS servers and allows us to collect all of the information we need for security purposes. We model known good traffic, and discard it, keeping only anomalous *** developed a custom analytics engine, which analyzes this data looking for evidence of botnet infections, blacklist hits, cloud platform abuse, beaconing, data exfiltration, and cache poisoning attempts. The results of these analyses is turned into a set of alerts which are sent to our security Operations Center (SOC). We've also developed a user interface including various visualizations to help analysts exp

关键词： domain name system security information and event management security operations

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Minimizing lifetime of sensitive data in concurrent programs 14

Minimizing lifetime of sensitive data in concurrent programs

引用

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

作者： Gondi, Kalpana Sistla, A. Prasad Venkatakrishnan, V.N. Department of Computer Science University of Illinois Chicago United States

ISBN: (纸本)9781450322782

The prolonged lifetime of sensitive data (such as passwords) in applications gives rise to several security risks. A promising approach is to erase sensitive data in an "eager fashion", i.e., as soon as its use is no longer required in the application. This approach of minimizing the lifetime of sensitive data has been applied to sequential programs. In this short paper, we present an extension of the this approach to concurrent programs where the interleaving of threads makes such eager erasures a challenging research problem. Copyright is held by the author/owner(s).

关键词： Sensitive data

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POSTER: Android System Broadcast Actions Broadcasts Your privacy 14

POSTER: Android System Broadcast Actions Broadcasts Your Pri...

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21st acm conference on Computer and Communications security (CCS)

作者： Mohsen, Fadi Shehab, Mohamed Bello-Ogunu, Emmanuel Al Jarrah, Abeer Univ North Carolina Charlotte Dept Software & Informat Syst Charlotte NC 28223 USA

ISBN: (纸本)9781450329576

Android provides finer-grained security features through a "permission" mechanism that puts limitations on the resources 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.

关键词： Broadcast Actions Receivers

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Detecting man-in-the-middle attacks on non-mobile systems 14

Detecting man-in-the-middle attacks on non-mobile systems

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

作者： Vallivaara, Visa Sailio, Mirko Halunen, Kimmo VTT Technical Research Center of Finland Finland

ISBN: (纸本)9781450322782

In this paper we propose a method for detecting man-in-themiddle attacks using the timestamps of TCP packet headers. From these timestamps, the delays can be calculated and by comparing the mean of the delays in the current connection to data gathered from previous sessions it is possible to detect if the packets have unusually long delays. We show that in our small case study we can find and set a threshold parameter that accurately detects man-in-the-middle attacks with a low probability of false positives. Thus, it may be used as a simple precautionary measure against malicious attacks. The method in its current form is limited to nonmobile systems, where the variations in the delay are fairly low and uniform. Copyright is held by the author/owner(s).

关键词： Network security

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privacy-preserving publication of provenance workflows 14

Privacy-preserving publication of provenance workflows

引用

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

作者： Maruseac, Mihai Ghinita, Gabriel Rughinis, Razvan UMass Boston United States Politehnica Univ. Bucharest Romania

ISBN: (纸本)9781450322782

Provenance workflows capture the data movement and the operations changing the data in complex applications such as scientific computations, document management in large organizations, content generation in social media, etc. Provenance is essential to understand the processes and operations that data undergo, and many research efforts focused on modeling, capturing and analyzing provenance information. Sharing provenance brings numerous benefits, but may also disclose sensitive information, such as secret processes of synthesizing chemical substances, confidential business practices and private details about social media participants' lives. In this paper, we study privacy-preserving provenance workflow publication using differential privacy. We adapt techniques designed for sanitization of multi-dimensional spatial data to the problem of provenance workflows. Experimental results show that such an approach is feasible to protect provenance workflows, while at the same time retaining a significant amount of utility for queries. In addition, we identify influential factors and trade-offs that emerge when sanitizing provenance workflows. Copyright is held by the author/owner(s).

关键词： Information services

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Aligning security and Business Objectives for Process-Aware Information Systems 15

Aligning Security and Business Objectives for Process-Aware ...

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proceedings of the 5th acm conference on data and application security and privacy

作者： Günter Karjoth Lucerne University of Applied Sciences and Arts Lucerne Switzerland

ISBN: (纸本)9781450331913

Enterprises are increasingly subject to compliance rules that originate from corporate guidelines, industry sector standards, and laws. The goal of access control is to protect against unauthorized users. However, threats also often reside within organizations where authorized users may misuse system resources. Although access control is fundamental in protecting information systems, it can pose an obstacle to achieving business objectives. Today, security policies have to be aligned with the business goals and are not anymore a purely technical issue. Business processes are therefore of special interest. When described by workflows, they define the causal dependencies between a set of tasks, whose execution constitutes a business objective. Already in 1999, Bertino, Ferrari and Atluri showed how to specify and enforce authorization constraints in workflow management systems [1]. But only in recent years, triggered by the raise of high-level modeling languages such as the Business Process Model and Notation (BPMN), business processes were enhanced with compliance requirements in terms of process annotations, tying the control objectives into the execution *** talk will look at recent research results in this area, including approaches to scope authorization constraints within workflows with loops and conditional execution [2], to capture the effects of enforcement on business objectives [3], and to select the optimal between multiple authorization policies satisfying the given constraints [4].This work was mainly done in collaboration with Samuel Burri, when we both were at IBM Research -- Zurich, and David Basin from ETH Zurich.

关键词： workflow cost-minimizing authorization policy access control enforcement separation of duty compliance obstruction business process

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OASIS: Operational access sandboxes for information security 4

OASIS: Operational access sandboxes for information security

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： Conti, Mauro Fernandes, Earlence Paupore, Justin Simionato, Daniel Università di Padova Padova Italy University of Michigan Ann ArborMI United States

ISBN: (纸本)9781450331555

Android's permission system follows an "all or nothing" approach when installing an application. The end user has no way to know how the permissions are actually used by the application, and how the sensitive data flows during its execution. With this work we present OASIS (Operational Access Sandboxes for Information security), a trusted component that allows developers to execute operations on sensitive data while keeping that data confidential. OASIS allows the end user to have full control over the data available to applications, and also grants policy based regulation of sensitive data ows. Moreover, our system can be deployed via a simple application installation, and does not require any modification to the stock Android OS. Copyright © 2014 by the Association for Computing Machinery, Inc. (acm).

关键词： Sensitive data

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Non-invasive user tracking via passive sensing: privacy risks of time-series occupancy measurement 7

Non-invasive user tracking via passive sensing: Privacy risk...

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2014 7th acm Workshop Artificial Intelligence and security, AISec 2014, Co-located with the acm conference on Computer and Communication security, CCS 2014

作者： Wang, Xiao Tague, Patrick Carnegie Mellon University United States

ISBN: (纸本)9781450331531

A large-scale sensing infrastructure can collect ample data to benefit many real-world applications. One promising application scenario is building management. However, exposure of the sensor data potentially reveals private details about building users. In this paper, we investigate indoor location privacy as a motivating example to manifest potential privacy risks in smart buildings. We apply inference techniques to reconstruct users' location traces from room-level occupancy data. Unlike other types of surveillance that are dedicated to explicit tracking such as security cameras, time-series occupancy traces, as aggregated environmental measurements, are typically deemed privacy-preserving. Unfortunately, it may still reveal some of the same sensitive information as privacy-invasive sensing such as video surveillance. We conduct experiments using a publicly available dataset and synthetic data. Our results demonstrate the underlying privacy leakage via occupancy data. We further show how our evaluation can enable adaptive privacy mechanisms to control the information leakage by the sensing system. © 2014 by the Association for Computing Machinery, Inc. (acm).

关键词： Time series

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