scholarly journals Anonymity in Peer-assisted CDNs: Inference Attacks and Mitigation

2016 ◽  
Vol 2016 (4) ◽  
pp. 294-314 ◽  
Author(s):  
Yaoqi Jia ◽  
Guangdong Bai ◽  
Prateek Saxena ◽  
Zhenkai Liang
Keyword(s):  
Web Service ◽  
Content Distribution ◽  
State Of The Art ◽  
Content Delivery ◽  
Web Content ◽  
Resource Request ◽  
Inference Attacks ◽  
Bandwidth Savings ◽  
Performance Gains ◽  
Client Side

Abstract The peer-assisted CDN is a new content distribution paradigm supported by CDNs (e.g., Akamai), which enables clients to cache and distribute web content on behalf of a website. Peer-assisted CDNs bring significant bandwidth savings to website operators and reduce network latency for users. In this work, we show that the current designs of peer-assisted CDNs expose clients to privacy-invasive attacks, enabling one client to infer the set of browsed resources of another client. To alleviate this, we propose an anonymous peer-assisted CDN (APAC), which employs content delivery while providing initiator anonymity (i.e., hiding who sends the resource request) and responder anonymity (i.e., hiding who responds to the request) for peers. APAC can be a web service, compatible with current browsers and requiring no client-side changes. Our anonymity analysis shows that our APAC design can preserve a higher level of anonymity than state-of-the-art peer-assisted CDNs. In addition, our evaluation demonstrates that APAC can achieve desired performance gains.

A Comparative Analysis of Content Delivery Network and Other Techniques for Web Content Delivery

2015 ◽  
Vol 6 (4) ◽  
pp. 43-58 ◽  
Author(s):  
Meenakshi Gupta ◽  
Atul Garg
Keyword(s):  
Service Providers ◽  
Content Delivery ◽  
Web Content ◽  
Content Delivery Network ◽  
And Performance ◽  
Client Side ◽  
Caching Proxy ◽  
The Web ◽  
Delivery Network

Web content delivery is based on client-server model. In this model, all the web requests for specific contents are serviced by a single web server as the requested contents reside only on one server. Therefore, with the increasing reliance on the web, the load on the web servers is increasing, thus causing scalability, reliability and performance issues for the web service providers. Various techniques have been implemented to handle these issues and improve the Quality of Service of the web content delivery to end-users such as clustering of servers, client-side caching, proxy server caching, mirroring of servers, multihoming and Content Delivery Network (CDN). This paper gives an analytical and comparative look on these approaches. It also compares CDN with other distributed systems such as grid, cloud and peer-to-peer computing.

Multi-criteria Web Services Selection: Balancing the Quality of Design and Quality of Service

2022 ◽  
Vol 22 (1) ◽  
pp. 1-31
Author(s):  
Marwa Daaji ◽  
Ali Ouni ◽  
Mohamed Mohsen Gammoudi ◽  
Salah Bouktif ◽  
Mohamed Wiem Mkaouer
Keyword(s):  
Quality Of Service ◽  
Web Services ◽  
Web Service ◽  
State Of The Art ◽  
Service Selection ◽  
Service Design ◽  
Design Quality ◽  
Trade Off ◽  
Selection Approach

Web service composition allows developers to create applications via reusing available services that are interoperable to each other. The process of selecting relevant Web services for a composite service satisfying the developer requirements is commonly acknowledged to be hard and challenging, especially with the exponentially increasing number of available Web services on the Internet. The majority of existing approaches on Web Services Selection are merely based on the Quality of Service (QoS) as a basic criterion to guide the selection process. However, existing approaches tend to ignore the service design quality, which plays a crucial role in discovering, understanding, and reusing service functionalities. Indeed, poorly designed Web service interfaces result in service anti-patterns, which are symptoms of bad design and implementation practices. The existence of anti-pattern instances in Web service interfaces typically complicates their reuse in real-world service-based systems and may lead to several maintenance and evolution problems. To address this issue, we introduce a new approach based on the Multi-Objective and Optimization on the basis of Ratio Analysis method (MOORA) as a multi-criteria decision making (MCDM) method to select Web services based on a combination of their (1) QoS attributes and (2) QoS design. The proposed approach aims to help developers to maintain the soundness and quality of their service composite development processes. We conduct a quantitative and qualitative empirical study to evaluate our approach on a Quality of Web Service dataset. We compare our MOORA-based approach against four commonly used MCDM methods as well as a recent state-of-the-art Web service selection approach. The obtained results show that our approach outperforms state-of-the-art approaches by significantly improving the service selection quality of top- k selected services while providing the best trade-off between both service design quality and desired QoS values. Furthermore, we conducted a qualitative evaluation with developers. The obtained results provide evidence that our approach generates a good trade-off for what developers need regarding both QoS and quality of design. Our selection approach was evaluated as “relevant” from developers point of view, in improving the service selection task with an average score of 3.93, compared to an average of 2.62 for the traditional QoS-based approach.

Towards Informed Web Content Delivery

2004 ◽  
pp. 232-248 ◽  
Author(s):  
Leeann Bent ◽  
Michael Rabinovich ◽  
Geoffrey M. Voelker ◽  
Zhen Xiao
Keyword(s):  
Content Delivery ◽  
Web Content

HTTPV

2014 ◽  
pp. 84-95
Author(s):  
Subrata Acharya
Keyword(s):  
Common Sense ◽  
Content Distribution ◽  
High Volume ◽  
Distribution Networks ◽  
Content Distribution Networks ◽  
Web Browser ◽  
Server Side ◽  
Integrity Protection ◽  
In Transit ◽  
Client Side

There is a need to be able to verify plaintext HTTP content transfers. Common sense dictates authentication and sensitive content should always be protected by SSL/HTTPS, but there is still great exploitation potential in the modification of static content in transit. Pre-computed signatures and client-side verification offers integrity protection of HTTP content in applications where SSL is not feasible. In this chapter, the authors demonstrate a mechanism by which a Web browser or other HTTP client can verify that content transmitted over an untrusted channel has not been modified. Verifiable HTTP is not intended to replace SSL. Rather, it is intended to be used in applications where SSL is not feasible, specifically, when serving high-volume static content and/or content from non-secure sources such as Content Distribution Networks. Finally, the authors find content verification is effective with server-side overhead similar to SSL. With future optimization such as native browser support, content verification could achieve comparable client-side efficiency.

Client-Side Handheld Computing and Programming

2011 ◽  
pp. 261-285
Author(s):  
Wen-Chen Hu
Keyword(s):  
Video Games ◽  
Personal Information ◽  
Weekly Schedule ◽  
Web Content ◽  
Server Side ◽  
Handheld Computing ◽  
Business Meetings ◽  
Wide Range ◽  
On Line ◽  
Client Side

There are two kinds of handheld computing and programming, namely client- and server- side handheld computing and programming. The most popular applications of the latter are used with database-driven mobile web content, whose construction steps were described in the previous section. The remainder of this book will be devoted to client-side handheld computing and programming, whose applications do not need the support of server-side programs. Client-side handheld applications are varied and numerous, covering a wide range of everyday activities. Popular application examples include: • address books, which store personal information such as addresses, telephone numbers, and email addresses in an accessible format, • appointments, which allow users to edit, save, and view times reserved for business meetings and visits to the doctor, • calculators, which may be a standard 4-function pocket calculator or a multifunction scientific calculator, • datebooks/calendars, which allow users to enter hourly activities and show a daily or weekly schedule, or a simple monthly view, • expenses, which allow users to track and record common business expenses such as car mileage, per diems, air fees, and hotel bills, • mobile office functions, which include viewing and processing documents, spread sheets, presentations, and inventory. • multimedia, which includes playing music and videos, photography, and personal albums. • note pads, which allow users to save, view, and edit text notes, • to-do lists, which allow users to enter a list of tasks to be performed, and • video games, in addition to those on-line video games that require the support of server-side programs.

HOPS: high-performance library for (non-)uniform sampling of convex-constrained models

2020 ◽  
Author(s):  
Johann F Jadebeck ◽  
Axel Theorell ◽  
Samuel Leweke ◽  
Katharina Nöh
Keyword(s):  
High Performance ◽  
State Of The Art ◽  
Source Code ◽  
Third Party ◽  
Supplementary Information ◽  
Scalable Algorithms ◽  
Uniform Sampling ◽  
Non Uniform Sampling ◽  
Constrained Models ◽  
Performance Gains

Abstract Summary The C++ library Highly Optimized Polytope Sampling (HOPS) provides implementations of efficient and scalable algorithms for sampling convex-constrained models that are equipped with arbitrary target functions. For uniform sampling, substantial performance gains were achieved compared to the state-of-the-art. The ease of integration and utility of non-uniform sampling is showcased in a Bayesian inference setting, demonstrating how HOPS interoperates with third-party software. Availability and implementation Source code is available at https://github.com/modsim/hops/, tested on Linux and MS Windows, includes unit tests, detailed documentation, example applications and a Dockerfile. Contact [email protected] Supplementary information Supplementary data are available at Bioinformatics online.

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