http://emamispnu.persiangig.com/Projects/Cloud%20Computing/science_2.pdf

Review: A survey on security issues in service delivery models of cloud computing

Over the Internet today, computing and communications environments are significantly more complex and chaotic than classical distributed systems, lacking any centralized organization or hierarchical control. There has been much interest in emerging Peer-to-Peer (P2P) network overlays because they provide a good substrate for creating large-scale data sharing, content distribution, and application-level multicast applications. These P2P overlay networks attempt to provide a long list of features, such as: selection of nearby peers, redundant storage, efficient search/location of data items, data permanence or guarantees, hierarchical naming, trust and authentication, and anonymity. P2P networks potentially offer an efficient routing architecture that is self-organizing, massively scalable, and robust in the wide-area, combining fault tolerance, load balancing, and explicit notion of locality. In this article we present a survey and comparison of various Structured and Unstructured P2P overlay networks. We categorize the various schemes into these two groups in the design spectrum, and discuss the application-level network performance of each group.

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A survey and comparison of peer-to-peer overlay network schemes

Recent technology trends in the Web Services (WS) domain indicate that a solution eliminating the presumed complexity of the WS-* standards may be in sight: advocates of REpresentational State Transfer (REST) have come to believe that their ideas explaining why the World Wide Web works are just as applicable to solve enterprise application integration problems and to simplify the plumbing required to build service-oriented architectures. In this paper we objectify the WS-* vs. REST debate by giving a quantitative technical comparison based on architectural principles and decisions. We show that the two approaches differ in the number of architectural decisions that must be made and in the number of available alternatives. This discrepancy between freedom-from-choice and freedom-of-choice explains the complexity difference perceived. However, we also show that there are significant differences in the consequences of certain decisions in terms of resulting development and maintenance costs. Our comparison helps technical decision makers to assess the two integration styles and technologies more objectively and select the one that best fits their needs: REST is well suited for basic, ad hoc integration scenarios, WS-* is more flexible and addresses advanced quality of service requirements commonly occurring in enterprise computing.

/pdf/restful-web-services-vs-big-web-services-making-the-right-2tg7890x7z.pdf

Restful web services vs. "big"' web services: making the right architectural decision

Service-Oriented Computing (SOC) is a new computing paradigm that utilizes services as the basic constructs to support the development of rapid, low-cost and easy composition of distributed applications even in heterogeneous environments. The promise of Service-Oriented Computing is a world of cooperating services where application components are assembled with little effort into a network of services that can be loosely coupled to create flexible dynamic business processes and agile applications that may span organizations and computing platforms. The subject of Service-Oriented Computing is vast and enormously complex, spanning many concepts and technologies that find their origins in diverse disciplines that are woven together in an intricate manner. In addition, there is a need to merge technology with an understanding of business processes and organizational structures, a combination of recognizing an enterprise's pain points and the potential solutions that can be applied to correct them. The materi...

/pdf/service-oriented-computing-a-research-roadmap-iuym80iybz.pdf

Service-oriented computing: a research roadmap

Cloud storage enables users to remotely store their data and enjoy the on-demand high quality cloud applications without the burden of local hardware and software management. Though the benefits are clear, such a service is also relinquishing users' physical possession of their outsourced data, which inevitably poses new security risks toward the correctness of the data in cloud. In order to address this new problem and further achieve a secure and dependable cloud storage service, we propose in this paper a flexible distributed storage integrity auditing mechanism, utilizing the homomorphic token and distributed erasure-coded data. The proposed design allows users to audit the cloud storage with very lightweight communication and computation cost. The auditing result not only ensures strong cloud storage correctness guarantee, but also simultaneously achieves fast data error localization, i.e., the identification of misbehaving server. Considering the cloud data are dynamic in nature, the proposed design further supports secure and efficient dynamic operations on outsourced data, including block modification, deletion, and append. Analysis shows the proposed scheme is highly efficient and resilient against Byzantine failure, malicious data modification attack, and even server colluding attacks.

/pdf/toward-secure-and-dependable-storage-services-in-cloud-1h1z2suddd.pdf

Toward Secure and Dependable Storage Services in Cloud Computing

Praise for Service-Oriented Architecture Compass"A comprehensive roadmap to Service-Oriented Architecture (SOA). SOA is, in reality, a business architecture to be used by those enterprises intending to prosper in the 21st century. Decision makers who desire that their business become flexible can jumpstart that process by adopting the best practices and rules of thumb described in SOA Compass."i¾Bob Laird, MCI IT Chief Architect"The book Service-Oriented Architecture Compass shows very clearly by means of real projects how agile business processes can be implemented using Service-Oriented Architectures. The entire development cycle from planning through implementation is presented very close to practice and the critical success factors are presented very convincingly."i¾Professor Dr. Thomas Obermeier, Vice Dean of FHDW Bergisch Gladbach, Germany"This book is a major improvement in the field. It gives a clear view and all the key points on how to really face a SOA deployment in today's organizations."i¾Mario Moreno, IT Architect Leader, Generali France"Service-Oriented Architecture enables organizations to be agile and flexible enough to adopt new business strategies and produce new services to overcome the challenges created by business dynamism today. CIOs have to consider SOA as a foundation of their Enterprise Applications Architecture primarily because it demonstrates that IT aligns to business processes and also because it positions IT as a service enabler and maximizes previous investments on business applications.To understand and profit from SOA, this book provides CIOs with the necessary concepts and knowledge needed to understand and adapt it into their IT organizations."i¾Sabri Hamed Al-Azazi, CIO of Dubai Holding, Sabri"I am extremely impressed by the depth and scale of this book! The title is perfecti¾when you know where you want to go, you need a compass to guide you there! After good IT strategy leads you to SOA, this book is the perfect vehicle that will drive you from dream to reality. We in DSK Bank will use it as our SOA bible in the ongoing project."i¾Miro Vichev, CIO, DSK Bank, Bulgaria, member of OTP Group"Service-Oriented Architecture offers a pathway to networking of intra- and inter-corporate business systems. The standards have the potential to create far more flexible and resilient business information systems than have been possible in the past. This book is a must-read for those who care about the future of business IT."i¾Elizabeth Hackenson, CIO, MCI"Service-Oriented Architecture is key to help customers become on demand businessesi¾a business that can quickly respond to competitive threats and be first to take advantage of marketplace opportunities. SOA Compass is a must-read for those individuals looking to bridge the gap between IT and business in order to help their enterprises become more flexible and responsive."i¾Michael Liebow, Vice President, Web Services and Service-Oriented Architecture, IBM Business Consulting Services"This book is a welcome addition to SOA literature. It articulates the business case and provides practical proven real-world advice, guidance, tips, and techniques for organizations to make the evolution from simple point-to-point web services to true SOA by addressing such topics as planning, organization, analysis and design, security, and systems management."i¾Denis O'Sullivan, Fireman's Fund Enterprise ArchitectMaximize the business value and flexibility of your SOA deploymentIn this book, IBM Enterprise Integration Team experts present a start-to-finish guide to planning, implementing, and managing Service-Oriented Architecture. Drawing on their extensive experience helping enterprise customers migrate to SOA, the authors share hard-earned lessons and best practices for architects, project managers, and software development leaders alike.Well-written and practical, Service-Oriented Architecture Compass offers the perfect blend of principles and "how-to" guidance for transitioning your infrastructure to SOA. The authors clearly explain what SOA is, the opportunities it offers, and how it differs from earlier approaches. Using detailed examples from IBM consulting engagements, they show how to deploy SOA solutions that tightly integrate with your processes and operations, delivering maximum flexibility and value. With detailed coverage of topics ranging from policy-based management to workflow implementation, no other SOA book offers comparable value to workingIT professionals.Coverage includes SOA from both a business and technical standpointi¾and how to make the business case Planning your SOA project: best practices and pitfalls to avoid SOA analysis and design for superior flexibility and value Securing and managing your SOA environment Using SOA to simplify enterprise application integration Implementing business processes and workflow in SOA environments Case studies in SOA deployment After you've deployed: delivering better collaboration, greater scalability, and more sophisticated applicationsThe IBM Press developerWorks® Series is a unique undertaking in which print books and the Web are mutually supportive. The publications in this series are complemented by resources on the developerWorks Web site on ibm.com. Icons throughout the book alert the reader to these valuable resources.

Service-Oriented Architecture Compass: Business Value, Planning, and Enterprise Roadmap

In the fast-paced global economy, a corporation must be flexible and agile to meet the shifting needs of operating in an on demand environment. Aligning information technology (IT) systems using service-oriented architecture (SOA) to provide end-to-end enterprise integration and virtualized IT services is a critical step. To be truly effective, however, the SOA paradigm also needs to be extended to transmute organizational structures and behavioral practices. In this paper, we first explore the governance, economic, and enterprise challenges to SOA-based IT transformation. Next, we raise the need to redesign the existing organizational models, and we propose the Human Services Bus (HSB), a new organizational structure that optimizes the workforce and streamlines cross-unit processes to leverage the new IT systems. Finally, we discuss the cultural transformation that is required to support the HSB transition and induce the changes required in management and behavioral practices. The issues and insights at all three layers-IT systems, organizational structures, and cultural practices-are based on IBM's experience with adopting on demand methods.

Impact of service-oriented architecture on enterprise systems, organizational structures, and individuals

Fundamentals and concepts Using the Globus Toolkit OGSA introduction This IBM Redbook is intended to give readers interested in the technical aspects of grid computing a hands-on introduction using the Globus Toolkit. This includes a discussion of the first basics of grid computing, and various grid products and architectures. This publication is a good starting point for learning about grid computing, and gives you a good foundation before learning more about the future of grid computing, OGSA, e-business, and IBM's vision of the on-demand era. This publication covers the following topics: - Grid computing fundamentals - Architecture and security considerations - Introduction of Open Grid Services Architecture (OGSA) - Description of the components of the Globus Toolkit - Globus Toolkit Version 2.2 implementation

Introduction to grid computing with globus

The Expert, Practical Guide to Succeeding with SOA in the Enterprise In Executing SOA, four experienced SOA implementers share realistic, proven, from-the-trenches guidance for successfully delivering on even the largest and most complex SOA initiative. This book follows up where the authors best-selling Service-Oriented Architecture Compass left off, showing how to overcome key obstacles to successful SOA implementation and identifying best practices for all facets of executiontechnical, organizational, and human. Among the issues it addresses: introducing a services discipline that supports collaboration and information process sharing; integrating services with preexisting technology assets and strategies; choosing the right roles for new tools; shifting culture, governance, and architecture; and bringing greater agility to the entire organizational lifecycle, not just isolated projects. Executing SOA is an indispensable resource for every enterprise architect, technical manager, and IT leader tasked with driving value from SOA in complex environments. Coverage includes Implementing SOA governance that reflects the organizations strategic and business focus Running SOA projects successfully: practical guidelines and proven methodologies around service modeling and design Leveraging reusable assets: making the most of your SOA repository Enabling the architect to choose the correct tools and products containing the features required to execute on the SOA method for service design and implementation Defining information services to get the right information to the right people at the right time Integrating SOA with Web 2.0 and other innovative products and solutions Providing highly usable human interfaces in SOA environments

Executing SOA: A Practical Guide for the Service-Oriented Architect

Enable your applications for grid computing Utilize the Globus Toolkit Programming hints, tips, and examples This IBM Redbook, a follow-on to Introduction to Grid Computing with Globus, SG24-6895, discusses the issues and considerations for enabling an application to run in a grid environment. Programming examples are provided based on the Globus Toolkit V2.2. The first part of this publication addresses various considerations related to grid-enabling an application, from the perspective of the infrastructure, the application, and the data requirements. The second part of this publication provides many programming examples in C/C++ and Java to help solidify the concepts of grid computing and the types of programming tasks that must be handled when developing an application intended to run in a grid environment.

Norbert Bieberstein

Papers

Service-Oriented Architecture Compass: Business Value, Planning, and Enterprise Roadmap

Impact of service-oriented architecture on enterprise systems, organizational structures, and individuals

Introduction to grid computing with globus

Executing SOA: A Practical Guide for the Service-Oriented Architect

Enabling applications for grid computing with globus