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The Cost of the "S" in HTTPS 14

The Cost of the "S" in HTTPS

引用

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

引用

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...

引用

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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privacy-preserving audit for broker-based health information exchange 14

Privacy-preserving audit for broker-based health information...

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

作者： Oh, Se Eun Chun, Ji Young Jia, Limin Garg, Deepak Gunter, Carl A. Datta, Anupam University of Illinois at Urbana-Champaign United States Carnegie Mellon University United States Max Planck Institute for Software Systems Germany

ISBN: (纸本)9781450322782

Developments in health information technology have encouraged the establishment of distributed systems known as Health Information Exchanges (HIEs) to enable the sharing of patient records between institutions. In many cases, the parties running these exchanges wish to limit the amount of information they are responsible for holding because of sensitivities about patient information. Hence, there is an interest in broker-based HIEs that keep limited information in the exchange repositories. However, it is essential to audit these exchanges carefully due to risks of inappropriate data sharing. In this paper, we consider some of the requirements and present a design for auditing broker-based HIEs in a way that controls the information available in audit logs and regulates their release for investigations. Our approach is based on formal rules for audit and the use of Hierarchical Identity-Based Encryption (HIBE) to support staged release of data needed in audits and a balance between automated and manual reviews. We test our methodology via an extension of a standard for auditing HIEs called the Audit Trail and Node Authentication Proffle (ATNA) protocol. Copyright 2014 acm.

关键词： Health

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Controlled Functional Encryption 14

Controlled Functional Encryption

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

作者： Naveed, Muhammad Agrawal, Shashank Prabhakaran, Manoj Wang, Xiaofeng Ayday, Erman Hubaux, Jean-Pierre Gunter, Carl A. Univ Illinois Urbana IL 61801 USA Indiana Univ Bloomington IN 47405 USA Ecole Polytech Fed Lausanne Lausanne Switzerland

ISBN: (纸本)9781450329576

Motivated by privacy and usability requirements in various scenarios where existing cryptographic tools (like secure multi-party computation and functional encryption) are not adequate, we introduce a new cryptographic tool called Controlled Functional Encryption (C-FE). As in functional encryption, C-FE allows a user (client) to learn only certain functions of encrypted data, using keys obtained from an authority. However, we allow (and require) the client to send a fresh key request to the authority every time it wants to evaluate a function on a ciphertext. We obtain efficient solutions by carefully combining CCA2 secure public-key encryption (or rerandomizable RCCA secure public-key encryption, depending on the nature of security desired) with Yao's garbled circuit. Our main contributions in this work include developing and formally defining the notion of C-FE;designing theoretical and practical constructions of C-FE schemes achieving these definitions for specific and general classes of functions;and evaluating the performance of our constructions on various application scenarios.

关键词： functional encryption computation over encrypted data fine-grained data control

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Inference attack against encrypted range queries on outsourced databases 14

Inference attack against encrypted range queries on outsourc...

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

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

ISBN: (纸本)9781450322782

To mitigate security concerns of outsourced databases, quite a few protocols have been proposed that outsource data in encrypted format and allow encrypted query execution on the server side. Among the more practical protocols, the "bucketization" approach facilitates query execution at the cost of reduced efficiency by allowing some false positives in the query results. Precise Query Protocols (PQPs), on the other hand, enable the server to execute queries without incurring any false positives. Even though these protocols do not reveal the underlying data, they reveal query access pattern to an adversary. In this paper, we introduce a general attack on PQPs based on access pattern disclosure in the context of secure range queries. Our empirical analysis on several real world datasets shows that the proposed attack is able to disclose significant amount of sensitive data with high accuracy provided that the attacker has reasonable amount of background knowledge. We further demonstrate that a slight variation of such an attack can also be used on imprecise protocols (e.g., bucketization) to disclose significant amount of sensitive information. Copyright 2014 acm.

关键词： Sensitive data

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CODASPY 2013 - proceedings of the 3rd acm conference on data and application security and privacy

CODASPY 2013 - Proceedings of the 3rd ACM Conference on Data...

引用

3rd acm conference on data and application security and privacy, CODASPY 2013

ISBN: (纸本)9781450318907

The proceedings contain 41 papers. The topics discussed include: for some eyes only: protecting online information sharing;do online social network friends still threaten my privacy?;exploring dependency for query privacy protection in location-based services;expression rewriting for optimizing secure computation;efficient discovery of de-identification policy options through a risk-utility frontier;data usage control enforcement in distributed systems;privacy by design: a formal framework for the analysis of architectural choices;comparative eye tracking of experts and novices in web single sign-on;cross-layer detection of malicious websites;a file provenance system;enhancing performance of searchable encryption in cloud computing;a fine-grained access control model for key-value systems;emulating Internet topology snapshots in deterlab;and a study of user password strategy for multiple accounts.

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SNOOP: privacy preserving middleware for secure multi-party computations 13

SNOOP: Privacy preserving middleware for secure multi-party ...

引用

13th Workshop on Adaptive and Reflective Middleware, ARM 2014, co-located with acm/IFIP/USENIX International Middleware conference

作者： Andersen, Anders Department of Computer Science UiT Arctic University of Norway Tromsø9037 Norway

ISBN: (纸本)9781450332323

SNOOP is an adaptive middleware for secure multi-party computations (SMC). It combines support for secure multi- party computations, encryption, public key infrastructure (PKI), certificates, and certificate authorities (CA). It is used to perform statistical analysis of electronic health record (EHR) data. EHR data are typically located at different general practices and hospitals. SNOOP and the deployment of SNOOP applications have to take into consideration legal, security and privacy issues involved in statistical analysis of such data. SNOOP tries to support a wide range of possible SMC algorithms and computing graphs. It pro- vides high-level programming abstractions that adapt to the current run-time environment at deploy time. Contracts are provided to match the application requirements with avail- Able run-time functionality and requirements. Copyright 2014 acm.

关键词： Middleware

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Workshop Summary of AiSec'14-2014 Workshop on Artificial Intelligent and security 14

Workshop Summary of AiSec'14-2014 Workshop on Artificial Int...

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

作者： Dimitrakakis, Christos Mitrokotsa, Aikaterini Rubinstein, Benjamin Chalmers Univ Technol Gothenburg Sweden Univ Melbourne Melbourne Vic Australia

ISBN: (纸本)9781450329576

It is our great pleasure to welcome you to the 2014 acm Workshop Artificial Intelligence and security (AISec 2014) -- the seventh annual workshop addressing technologies that fuse intelligent systems into computer security applications and the implications of these approaches. The workshop's aim is to advance research at the intersection of artificial intelligence, machine learning, privacy and security. In particular, AISec gives researchers and practitioners working within one or more of those fields a platform for interdisciplinary discussion, which would otherwise be lacking. Hopefully, the workshop will lead to the initiation of knew col- laborations between groups working across these areas. The papers to be presented in this year's program include topics such as the analysis of privacy, adversarial learning models, intrusion detection and automatic advertisement filtering. We are delighted to again be co-located with the premier acm Computer and Communication security (CCS 2014) conference. This year we had 23 submissions from Asia, Europe and North America. This year, the workshop also includes a "presentation-only" track, for papers appearing elsewhere. After a rigorous reviewing process, 11 original papers were accepted for presentation at the workshop, while one paper was accepted for peresentation *** AISec 2014 was a team effort made possible by colleagues from institutions around the world. We sincerely thank the AISec program committee and external reviewers for their invaluable efforts towards guaranteeing a strong program, and the authors of papers who provided us with such excellent material. Their high caliber submissions and the thoughtful feedback from the reviewers continue to ensure the success of the acm AISec workshop series. Finally, we wish to thank the acm CCS organizers, for providing us with a suitable forum and for their continued support of this workshop. We believe that the workshop program will be interesting not only fo

关键词： data mining security machine learning artificial intelligence cryptography privacy

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application impersonation: Problems of OAuth and API design in online social networks 14

Application impersonation: Problems of OAuth and API design ...

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2nd acm conference on Online Social Networks, COSN 2014

作者： Hu, Pili Yang, Ronghai Li, Yue Lau, Wing Cheong Department of Information Engineering Chinese University of Hong Kong Hong Kong Department of Computer Science College of William and Mary United States

ISBN: (纸本)9781450331982

OAuth 2.0 protocol has enjoyed wide adoption by Online Social Network (OSN) providers since its inception. Although the security guideline of OAuth 2.0 is well discussed in RFC6749 and RFC6819, many real-world attacks due to the implementation specifics of OAuth 2.0 in various OSNs have been discovered. To our knowledge, previously discovered loopholes are all based on the misuse of OAuth and many of them rely on provider side or application side vulnerabilities/faults beyond the scope of the OAuth protocol. It was generally believed that correct use of OAuth 2.0 is secure. In this paper, we show that OAuth 2.0 is intrinsically vulnerable to App impersonation attack due to its provision of multiple authorization flows and token types. We start by reviewing and analyzing the OAuth 2.0 protocol and some common API design problems found in many 1st-tiered OSNs. We then propose the App impersonation attack and investigate its impact on 12 major OSN providers. We demonstrate that, App impersonation via OAuth 2.0, when combined with additional API design features/deficiencies, make large-scale exploit and privacy-leak possible. For example, it becomes possible for an attacker to completely crawl a 200-million-user OSN within just one week and harvest data objects like the status list and friend list which are expected, by its users, to be private among only friends. We also propose fixes that can be readily deployed to tackle the OAuth2.0-based App impersonation problem. Copyright © 2014 acm.

关键词： Social networking (online)

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