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

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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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proceedings of the acm conference on Computer and Communications security

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

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

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

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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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CODASPY'12 - proceedings of the 2nd acm conference on data and application security and privacy

CODASPY'12 - Proceedings of the 2nd ACM Conference on Data a...

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

ISBN: (纸本)9781450310918

The proceedings contain 31 papers. The topics discussed include: secure and efficient proof of storage with deduplication;measuring query privacy in location-based services;deriving implementation-level policies for usage control enforcement;discovering access-control misconfigurations: new approaches and evaluation methodologies;comparison-based encryption for fine-grained access control in clouds;relationship-based access control: its expression and enforcement through hybrid logic;bounding trust in reputation systems with incomplete information;cookie-based privacy issues on Google services;refinement-based design of a group-centric secure information sharing model;risk-based security decisions under uncertainty;quantitative access control with partially-observable Markov decision processes;role engineering: from theory to practice;and privacy streamliner: a two-stage approach to improving algorithm efficiency.

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The Cost of the "S" in HTTPS 14

The Cost of the "S" in HTTPS

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10th acm International conference on Emerging Networking Experiments and Technologies (acm CoNEXT)

作者： Naylor, David Finamore, Alessandro Leontiadis, Ilias Grunenberger, Yan Mellia, Marco Munafo, Maurizio Papagiannaki, Konstantina Steenkiste, Peter Carnegie Mellon Univ Pittsburgh PA 15213 USA Politecn Torino Turin Italy Telefon Res Barcelona Spain

ISBN: (纸本)9781450332798

Increased user concern over security and privacy on the Internet has led to widespread adoption of HTTPS, the secure version of HTTP. HTTPS authenticates the communicating end points and provides confidentiality for the ensuing communication. However, as with any security solution, it does not come for free. HTTPS may introduce overhead in terms of infrastructure costs, communication latency, data usage, and energy consumption. Moreover, given the opaqueness of the encrypted communication, any in-network value added services requiring visibility into application layer content, such as caches and virus scanners, become ineffective. This paper attempts to shed some light on these costs. First, taking advantage of datasets collected from large ISPs, we examine the accelerating adoption of HTTPS over the last three years. Second, we quantify the direct and indirect costs of this evolution. Our results show that, indeed, security does not come for free. This work thus aims to stimulate discussion on technologies that can mitigate the costs of HTTPS while still protecting the user's privacy.

关键词： HTTP 2.0 HTTPS TLS privacy security Web proxies

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Efficient privacy-aware search over encrypted databases 14

Efficient privacy-aware search over encrypted databases

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

作者： Kuzu, Mehmet Islam, Mohammad Saiful Kantarcioglu, Murat Department of Computer Science University of Texas at Dallas Richardson TX United States

ISBN: (纸本)9781450322782

In recent years, database as a service (DAS) model where data management is outsourced to cloud service providers has become more prevalent. Although DAS model offers lower cost and flexibility, it necessitates the transfer of potentially sensitive data to untrusted cloud servers. To ensure the confidentiality, encryption of sensitive data before its transfer to the cloud emerges as an important option. Encrypted storage provides protection but it complicates data processing including crucial selective record retrieval. To achieve selective retrieval over encrypted collection, considerable amount of searchable encryption schemes have been proposed in the literature with distinct privacy guarantees. Among the available approaches, oblivious RAM based ones offer optimal privacy. However, they are computationally intensive and do not scale well to very large databases. On the other hand, almost all efficient schemes leak some information, especially data access pattern to the remote servers. Unfortunately, recent evidence on access pattern leakage indicates that adversary's background knowledge could be used to infer the contents of the encrypted data and may potentially endanger individual privacy. In this paper, we introduce a novel construction for practical and privacy-aware selective record retrieval over encrypted databases. Our approach leaks obfuscated access pattern to enable efficient retrieval while ensuring individual privacy. Applied obfuscation is based on differential privacy which provides rigorous individual privacy guarantees against adversaries with arbitrary background knowledge. Copyright 2014 acm.

关键词： Sensitive data

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Wiretap-proof: What they hear is not what you speak, and what you speak they do not hear 14

Wiretap-proof: What they hear is not what you speak, and wha...

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

作者： Sengar, Hemant Wang, Haining Iranmanesh, Seyed Amir Technology Development VoDaSec Solutions Fairfax VA United States Dept. of Computer Science College of William and Mary Williamsburg VA United States

ISBN: (纸本)9781450322782

It has long been believed that once the voice media between caller and callee is captured or sniffed from the wire, either legally by law enforcement agencies or illegally by hackers through eavesdropping on communication channels, it is easy to listen into their conversation. In this paper, we show that this common perception is not always true. Our real-world experiments demonstrate that it is feasible to create a hidden telephonic conversation within an explicit telephone call. In particular, we propose a real-time covert communication channel within two-way media streams established between caller and callee. The real-time covert channel is created over the media stream that may possibly be monitored by eavesdroppers. However, the properly encoded media stream acts as a cover (or decoy) carrying bogus media such as an earlier recorded voice conversation. This spurious content will be heard if the media stream is intercepted and properly decoded. However, the calling and called parties protected by the covert communication channel can still directly talk to each other in privacy and real-time, just like any other normal phone calls. This work provides an additional security layer against media interception attacks, however it also exposes a serious security concern to CALEA (Communications Assistance for Law Enforcement Act) wiretapping and its Infrastructure. Copyright 2014 acm.

关键词： security systems

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