Informática

INGLÊS

Fortnite Official: The Battle Royale Survival Guide

de Epic Games

1,99€ + 10% EM CARTÃO

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 The official book of tips from Epic Games, creators FORTNITE. Filled with tricks and tactics for fans of ALL ages, 100 Ways to Rule is a must-have for any player who wants to master Battle Royale!
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Creating Games - Mechanics, Content, And Technology

de Morgan Mcguire e Odest Chadwicke Jenkins

121,89€ + 10% EM CARTÃO

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 Presents an overview of the technology and mechanisms of game design. This book emphasizes the broad view of a game team and teaches you about your teammates' area so that you can work effectively with them. It includes many worksheets and exercises to help get your small indie team off the ground.
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Artificial Intelligence For Computer Games - An Introduction

de John David Funge

87,44€ + 10% EM CARTÃO

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 This book provides spark new interest among academics in Artificial Intelligence (AI) research for computer games that will generate enthusiasm for AI among game designers and players. It also provides a complementary approach that presents a more unified overview of AI in games.
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Internet Searching And Indexing - The Subject Approach

de Alan R Thomas e James R Shearer

~~38,41€~~ 34,57€ 10% IMEDIATO

DISPONIBILIDADE IMEDIATA

 Prevent information overload with better indexing and retrieval strategies!In the fast-changing world of the Internet, the skills of the librarian are indispensable for managing the overwhelming amount of available data. Internet Searching and Indexing examines the tools and procedures available now and for the future that will help librarians, students, and patrons search the Internet more systematically, while helping information professionals design more efficient, effective search engines and Web pages. This comprehensive volume offers usable information for people at all levels of Internet savvy. Its clear explanations of the various ways search engines are structured will help new users take advantage of their attributes to design more effective retrieval strategies. It suggests practical ways for information professionals to use traditional library tools and concepts to make the Web more accessible. Moreover, it shows how the Web can be tapped as an immense resource to help librarians in the process of subject classification.Internet Searching and Indexing offers specific guidance on: how to classify various Web search tools and take advantage of their capabilities using signposts such as indexes, directories, and metadata to improve access to information on the Web the advantages of using facet analysis in Web page organizing, indexing, and searching the links between Internet subject trees and conventional bibliographic classification guidelines for interface design for developing Web-based OPACs applying Library of Congress subject headings to classifying Web subject access . . . and moreWith the vast amount of information that is added to the Web each day, finding data is becoming more time consuming and more complex. Internet Searching and Indexing will help you decrease the time you spend searching for the information you need and assist you in cataloging, classification, indexing, and creating quick and effective retrieval methods.
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Game Narrative Design And Ux Fundamentals - Tools For Player-Centric Storytelling

de Abigail Rindo

~~66,24€~~ 59,62€ 10% IMEDIATO

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 Game narrative and UX share a deep, interconnected relationship. This book explores the connections between narrative and UX to develop a framework for creating player centric stories in games by covering best practices in both crafts using a unified language.
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Practical Guide To Content Delivery Networks

de Gilbert Held

82,14€ + 10% EM CARTÃO

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 Following in the tradition of its popular predecessor, A Practical Guide to Content Delivery Networks, Second Edition offers an accessible and organized approach to implementing networks capable of handling the increasing data requirements of today'salways on mobile society. Describing how content delivery networks (CDN) function, it provides an understanding of Web architecture, as well as an overview of the TCP/IP protocol suite. The book reports on the development of the technologies that have evolved over the past decade as distribution mechanisms for various types of Web content. Using a structural and visual approach, it provides step-by-step guidance through the process of setting up a scalable CDN. Supplies a clear understanding of the framework and individual layers of design, including caching and load balancing Describes the terminology, tactics, and potential problems when implementing a CDN Examines cost-effective ways to load balance web service layers Explains how application servers connect to databases and how systems will scale as volume increases Illustrates the impact of video on data storage and delivery, as well as the need for data compression Covers Flash and the emerging HTML5 standard for video Highlighting the advantages and disadvantages associated with these types of networks, the book explains how to use the networks within the Internet operated by various ISPs as mechanisms for effectively delivering Web server based information. It emphasizes a best-of-breed approach to building your network to allow for an effective CDN to be built on practically any budget. To help you get started, this vendor-neutral reference explains how to code Web pages to optimize the delivery of various types of media. It also includes examples of successful approaches, from outsourcing to do it yourself.
INGLÊS

Xml Databases And The Semantic Web

de Bhavani Thuraisingham

87,44€ + 10% EM CARTÃO

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 Covers three technologies of impact for electronic business: Extensible Markup Language (XML), Semi-structured Databases, and the Semantic Web. This book highlights the implications of these technologies for E-Business. It presents a comprehensive view of critical technologies for the Web in general and XML in particular.
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Service-Oriented Architecture - Soa Strategy, Methodology, And Technology

de H. Howell-Barber e James P. Lawler

82,14€ + 10% EM CARTÃO

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 Firms are aggressively beginning to design, develop, and implement advanced and complex Web service systems. This book guides readers through the business strategies, methodologies, and technologies used to plan and deploy Web services. It includes case studies that illustrate business dimensions and technological dimensions.
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You Know You'Re A Gamer When

de Jason Jack

8,99€ + 10% EM CARTÃO

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 You Know You're A Gamer When . . . Gamers come in all shapes and sizes, but the one thing that we all have in common is our love of gaming.Recognize yourself in the pages of You Know You're A Gamer When . . ., a tome of over 200 direct, relatable, odd ball, and often comedic statements about being a gamer.You know you're a gamer when. . . During a boring conversation, you hope a "skip cut scene" button will appear next to you.. . . You own more games than you can possibly play in a lifetime, let alone beat.. . . You have fallen asleep with a controller in your hand.Enjoy hundreds of fun, often relatable, gamer qualities in the pages of You Know You're a Gamer Whe . . ., today!Visit WalapieMedia today!
INGLÊS

Android: What It Is And How To Use It

de Roger Carter

0,99€ + 10% EM CARTÃO

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 This book explains not just how to use your Android smartphone or tablet, but what Android is and the roles played by the different parts of the Android desktop.It is aimed at retired people and others who may be struggling with their Android device, and it can be used as study material by u3a Android or smartphone groups.
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Heuristic Methods Of Agile Satellites Coordination & Schedul

de Lei He, Lining Xing, Xiaolu Liu, Yingguo Chen e Yingwu Chen

~~59,54€~~ 53,59€ 10% IMEDIATO

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 This book delves into the complex and evolving field of agile Earth observation satellite technology and its scheduling challenges. With the capability for large-angle maneuvering, stereo and continuous area imaging, these satellites significantly expand observational capabilities. However, the rapid enhancement of these satellites, paired with increasing observational demands, has made agile satellite scheduling an NP-hard problem. Research into collaborative scheduling for agile satellites has thus become crucial.Heuristic Methods of Agile Satellites Coordination and Scheduling presents a systematic overview of the authors' research findings, with a focus on the application of heuristic optimization methods. The book consists of six chapters covering basic theory, technical challenges, and solutions for agile satellite scheduling; particularly focusing on time-dependent scheduling, multi-satellite coordination, scheduling considering time-varying cloud cover and emergency task response.The book broadens horizons and provides practical guidance for graduate students, researchers, and professionals in management science and engineering, and remote sensing applications.Contents: <ul><li>Introduction</li><li>Time-Dependent Single Agile Satellite Scheduling Problem</li><li>Time-Dependent Multi-Agile Satellite Coordination and Scheduling Problem</li><li>Multi-Satellite Coordination and Scheduling Considering Cloud Cover</li><li>Onboard Distributed Coordination and Scheduling for Emergency Tasks</li><li>Summary & Prospects</li><li>Appendix 1 Detailed Results of Hierarchical Scheduling Algorithms</li><li>Appendix 2 Abbreviation List</li></ul>Readership: Graduate students and researchers in management science and engineering, and remote sensing applications.By (Author)Yingguo Chen
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Rule Based Integration Of Web Services Into Semantic Data Bases

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Rule Based Integration Of Web Services Into Semantic Data Bases

de Jochen Gruber

34,22€ + 10% EM CARTÃO

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 Master's Thesis from the year 2006 in the subject Computer Science - Internet, New Technologies, grade: 1,1, University of Hagen (Institut fur Informatik), language: English, abstract: Details of a semantic annotation are outlined, both for the semantic model consisting of concepts to model the area of discourse as well as the individual model for a single service. The annotation is used to build a concrete implementation of a generic processing framework translating the annotation of a service into rules to be integrated into an OWL knowledge base rule engine. The realization is done for the Jena Semantic Web Framework, an open source library for Semantic Web application for the Java language. The realization is designed as an add-on to Jena which integrates service calls in such a way that service invocation is transparent to applications building on Jena. A discussion on optimizations, both implemented ones and realizable but not implemented ones is included. They can serve as starting points for moving the implementation from a proof of concept status to real world usability. The section finishes with some considerations on general run-time behavior. Finally the presented framework is evaluated in more detail: Firstly, a sophisticated scenario for the running example is described and shown, how automated service selection, composition and invocation is actually realized during run-time. Then the approach is evaluated with regard to services with more complex parameterizations with particular focus on the data supplied to the services and the rules generated from such complex parameterized services and whether such rules are still usable. The prime design rationale of the presented framework implementation is as a proof of concept for the approach of generically integrating Web Services as rules with Semantic knowledge bases. Therefore there is still a long way to go for a real world application to be build on the framework. At several points notes are added hinting on potential challenges, particularly with regard to specific techniques for optimizing reasoning on knowledge bases. Neither are these remarks to be seen as exhaustive nor are they to be understood as short treatments. Rather they are intended as selected starting points for further research.
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Windowsmedia - The Role Of Microsoft Corporation In The Current Multimedia Industry

eBook 10%

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Windowsmedia - The Role Of Microsoft Corporation In The Current Multimedia Industry

de Claudius Benedikt Hildebrand

18,27€ + 10% EM CARTÃO

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 Seminar paper from the year 2002 in the subject Computer Science - Internet, New Technologies, grade: 88% (A), UNITEC New Zealand (Faculty of Business - Department of Information Systems and Computing), course: Interactive Multimedia Development 1, language: English, abstract: This report will evaluate the role of Microsoft Corporation in the current multimedia industry. In order to get an impression about Microsoft's business, there is an overview of Microsoft's products and services at first. Next, it will be Microsoft's strongest competitors in the operating system market as most consumers of multimedia services have a Windows operating system which included a player for multimedia content. This player called Windows Media Player is being discussed and compared to the RealNetworks' RealOne player which is regarded as one of Microsoft's strongest competitors in the multimedia business. Consecutively, there is an investigation of electronic devices currently supporting the technology provided by Microsoft including different audio- and video codecs. Finally, there is a conclusion showing the results of the research and giving some recommendations when deciding which multimedia environment to choose: Microsoft or RealNetworks.
INGLÊS

Sensor Based Temperature Conditioning Using Water

de Edralyn Diacamos

~~42,28€~~ 38,05€ 10% IMEDIATO

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 Bachelor Thesis from the year 2024 in the subject Computer Science - Internet, New Technologies, grade: 3rd Year, , course: Computer Technology, language: English, abstract: This study focuses on developing and evaluating a sensor-based temperature conditioning system using water sprinklers for small-scale piggery farms at Cebu Technological University- Tuburan Campus. The main objectives are to identify and define the technical requirements for fabricating the sensor-based system, including detailed device plans, project costs, and design specifications. It also aims to assess the system's effectiveness in terms of features, functions, conformance, maintenance, serviceability, and durability to ensure it meets the practical needs of small-scale piggery farms. Additionally, the study evaluates user acceptability based on perceived usefulness, ease of use, behavioral intention to use, and actual usage, providing insights into its potential adoption and integration into farm practices. Finally, the study seeks to develop a comprehensive maintenance program to support the long-term sustainability and operational efficiency of the sensor-based temperature conditioning system in piggery farms. The study employs a quantitative research method to gather insights from stakeholders involved in small-scale piggery farming. The research is anchored in theories such as the Technology Acceptance Model, Technology Dimension Theory, Technology Adoption, and relevant local legislation such as Republic Act No. 11293 and Republic Act No. 11337. Findings will highlight the importance of user familiarity with product features to enhance usability and prevent confusion. Moving forward, collaborative efforts between stakeholders and researchers will be essential to optimize the sensor-based temperature conditioning system, ensuring its effectiveness and alignment with local needs and sustainability objectives. Positive results from the effectiveness and product acceptability assessments are expected to indicate strong support for the system's usability, impact, and potential to improve temperature management in small-scale pig farming.
INGLÊS

Semantic Annotation Of View-Based Object Representations Using Online Search Engines

42,23€ + 10% EM CARTÃO

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 Master's Thesis from the year 2015 in the subject Computer Science - Internet, New Technologies, grade: 1.3, University of Paderborn (Institute of Electrical Engineering and Information Technology), language: English, abstract: In this master's thesis, an automatic image annotation algorithm for object recognition systems is being developed and evaluated. Addressing the semantic gap problem, it is investigated by which means images of objects can automatically be labelled with textual tags that represent corresponding semantic information. A central question in this context is to what extent online databases are exploitable for such an annotation algorithm. Representative works from the literature normally use large scale databases containing images along their features and their semantic information. Queued images can be annotated by searching the database for images with similar features and using the provided semantics. This work focuses another approach, where the semantic information are extracted from additional sources, such as texts according to visually similar images on websites. Those images are found in online databases or on the web using search engines. By this means, a broad range of objects can be handled without the need to create a database. Techniques will be implemented and analyzed that find websites containing images similar to the image to be annotated and that mine semantic information from corresponding texts. Eventually the system will be tested with a range of images with objects of different difficulties.
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Data Mining Unveiled. Definition, Evolution, And Key Processes

6,72€ + 10% EM CARTÃO

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 Seminar paper from the year 2014 in the subject Computer Science - Internet, New Technologies, grade: 1.7, University of Applied Sciences Braunschweig / Wolfenbuttel; Salzgitter, language: English, abstract: The objective of this work is to provide a comprehensive understanding of data mining: defining its concept, tracing its evolution, elucidating its methods and tasks, and describing its typical process
INGLÊS

Biased Algorithms In Law Enforcement Agencies. A Case Study Of The La Police Department

de Julian Schoenemeyer

15,98€ + 10% EM CARTÃO

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 Case Study from the year 2023 in the subject Computer Science - Internet, New Technologies, grade: 1,0, Charles University in Prague (Faculty of Social Sciences), course: Security and Technology, language: English, abstract: This paper tries to answer the question, how the LA Police Department uses AI (Artificial Intelligence) algorithms to profile criminality. Can these algorithms always be fair and impartial? In today s society, we are constantly surrounded by artificial intelligence, especially by algorithms that try to profile us to predict our future behaviour. These algorithms are deeply embedded in our daily lives, whether we are watching Netflix, using Amazon music or do online shopping, they try to present us with suggestions to get us more involved with the platform to spend more time there and therefore more money. But these algorithms are not only operated by business companies alone, they are also implemented with public policy providers and law enforcement agencies, like police forces. First, the author gives a detailed explanation of how these algorithms work, then he lists examples in which areas police forces might use these algorithms, such as facial recognition software and making suggestions about the sentencing of criminals. However, the paper also discusses critique of the use of technology by law enforcement. Many ascribe these algorithms a certain bias, especially racially, having mainly been trained on a dataset, which in itself is biased. The next chapter contains the author's methodology, which he then applies to his case study about the LA Police Department in the last part of his paper.
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Dynamic Routing Protocols. Creating Stability And Reliability Through Evaluation And Comparison

19,40€ + 10% EM CARTÃO

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 Master's Thesis from the year 2022 in the subject Computer Science - Internet, New Technologies, grade: 1,5, , language: English, abstract: The main objective of this study is the empirical analysis of the evaluation and comparison of dynamic routing protocols regarding their stability and reliability. An especially close look will be paid to EIGRP, OSPF, and RIP; RIP (Routing Information Protocol) being one of the oldest routing protocols still in service. A routing protocol is a protocol which is responsible to determine how routers communicate with each other and forward packets through an optimal path, travelling from source node to destination node. Each routing protocols performs in different ways. They have their own architecture, route to follow and sometimes even delays in packets. OSPF builds a database of routes to its neighbors, using an algorithm to calculate the best possible path. EIGRP is a vector routing protocol that is used on a computer network to help automate routing decisions and configuration. The author of this text is not a native English speaker. Please excuse any grammatical errors and other inconsistencies.
INGLÊS

Blockchain. The Disruptive Potential In The Financial Sector

de Pascal Wald

15,62€ + 10% EM CARTÃO

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 Seminar paper from the year 2017 in the subject Computer Science - Internet, New Technologies, grade: 1,3, University of Applied Sciences Bonn, language: English, abstract: This paper aims to provide an overview of the main opportunities and limitations of blockchain and, on this basis, to assess what disruptive potential can be attributed to the technology in the financial sector. First, conceptual and theoretical foundations are described. The functionality of the blockchain will be explained using the example of Bitcoins in order to be able to address the potential fields of application and their significance for the financial sector in the following. Finally, core statements will be concluded.
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Energy Efficient And Dynamic Security Protocol For Wireless Sensor Networks

eBook 10%

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Energy Efficient And Dynamic Security Protocol For Wireless Sensor Networks

de Adil Bashir e Ajaz Hussain Mir

34,26€ + 10% EM CARTÃO

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 Master's Thesis from the year 2013 in the subject Computer Science - Internet, New Technologies, grade: 8.12, , course: M. Tech, language: English, abstract: Wireless sensor network (WSN) is an emerging imperious leading technology of the current century that presents great promise for various pioneering applications. The use of sensor networks should keep developing, mainly in the fields of scientific, logistic, healthcare and military applications. Sensor networks interact and collect sensitive data and operate in unattended hostile environments, thus it is imperative to pay attention to the security of wireless sensor networks as they are highly prone to threats. For successful operation of the nodes, it is important to maintain the security and privacy of the transmitted data as well as the data stored at nodes. The different security protocols and models used in the wired and other wireless networks such as ad-hoc networks cannot be used in WSNs because the sensor size poses significant restrictions, mainly in terms of energy autonomy and node lifetime, as the batteries have to be too tiny. Also, the existing security protocols in these constrained networks are not sufficiently energy efficient, which is the real motivation behind this work. In this thesis, a light-weight dynamic security algorithm titled An Energy Efficient and Dynamic Security Protocol (EEDSP) for wireless sensor networks has been proposed and implemented at nodal level. We also implement an existing algorithm and then carry out the performance analysis of both the algorithms in terms of energy consumptions, node lifetime and memory requirements at source and intermediate nodes to verify the improvement in our protocol s results.
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Technological Change And The Future Of Work. Online &Quote;Water-Cooler&Quote; Conversations?

eBook 10%

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Technological Change And The Future Of Work. Online &Quote;Water-Cooler&Quote; Conversations? - How Instant Messaging Devices Enforce The Blending Of Personal And Professional Life And Impose New Challenges For Eu Labor Law Protection

15,98€ + 10% EM CARTÃO

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 Seminar paper from the year 2020 in the subject Computer Science - Internet, New Technologies, grade: 1,3, University of Twente , language: English, abstract: The question, driving the following essay can be written down as follows? What makes IM (Instant Messaging) devices such as Slack different from earlier technologies such as e-mail and chat?With increasing global connectivity, modern organizations face rapid organizational changes as for instance the increasing decentralized collaboration. IM is a communication technology that allows people to send and receive short text-based messages in real-time and to see who else is currently available. Many IM systems are available to be downloaded from the internet or come with other free software products. Commonly known examples are the ICQ Chat or the Facebook Messenger. Further, there are several IM systems that have been developed particularly for the professional use within organizations or other team-based work (Cameron & Webster, 2005). An exemplary IM device for the corporate use is ?Slack.?Slack is a cloud-based digital workspace and information management system (Johnson, 2018, p. 148) that was published in 2013 and originally developed to manage productivity and improve team efficiency (Slack Technologies, 2020). It is a collaborative tool that facilitates streamlined communication. One of the main features is the? broad accessibility? that Slack offers: Users can access the platform via the web, a desktop plugin or even on a mobile application. Thus, Slack allows team members from different organizations as well as from different locations to join the collaborations and therefore enables ?real-time conversations.? Those conversations, which can be direct and private as well as within group chats, are combined into one central location (the workspace ) that keeps all messages archived. Within this workspace, channels dedicated to a specific group, project or topic are compromised. Furthermore, Slack integrates several external applications such as Google Drive or Dropbox to enhance any project-related management (Johnson, 2018).
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Wireless Personal Area Networking Technologies For Low-Power Smart-Home Applications

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Wireless Personal Area Networking Technologies For Low-Power Smart-Home Applications - Analysis And Comparison

de Andreas Landgraf

21,70€ + 10% EM CARTÃO

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 Bachelor Thesis from the year 2015 in the subject Computer Science - Internet, New Technologies, grade: 2,00, Campus02 University of Applied Sciences Graz, language: English, abstract: This thesis will introduce the requirements of modern Smart Homes and outline the key wireless networking technologies available for personal networks in Smart Homes. The information is based on data from various sources, such as articles, research papers and books. Finally, this thesis presents a guidance for selecting these networking technologies for energy efficient Smart Home applications. Wireless networking technologies are widely used in communication devices and services in almost every area of daily business. Medical environments, security authorities, and other organizations use them to increase their performance. In particular the Smart Home sector is one of the areas that has been researched extensively. From ecological and technological point of view, the opportunities for new technologies are vast. Therefore, it is important to compare such technologies using ecological parameters. This thesis will give an overview of the wireless network types, ranging from body area to global area networks, and introduces the different Smart Home networks. Furthermore, the major wireless networking technologies of personal area networks, Bluetooth, Bluetooth Smart, Ultra-Wideband, ZigBee, Internet Protocol version 6 over Low-Power Wireless Personal Area Network and Wi-Fi, are discussed in detail. A comparison is made with current chipset manufacturers implementations to create a tabular overview of these technologies and their suitability in Smart Home networks. Results show that every technology has its optimal field of application in a modern Smart Home. However, it can be concluded that further experiments will show more accurate results.
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Coexisting Problems For Wireless Sensor Networks Working In 2.4 Ghz Frequency Band

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Coexisting Problems For Wireless Sensor Networks Working In 2.4 Ghz Frequency Band

de Vikram Kulkarni

42,14€ + 10% EM CARTÃO

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 Document from the year 2019 in the subject Computer Science - Internet, New Technologies, , course: Wireless Sensor Networks, Home Area Networks, language: English, abstract: The objectives of this research are: To propose a scheme to estimate the future interference and enable efficient channel switching mechanism to avoid interference for Wireless Sensor Network (WSN) as per the latency requirements specified by Smart Grid (SG). To propose an algorithm for efficient data recovery mechanism so that ZigBee devices can quickly familiarize with the encoding according to the highly dynamic WiFi traffic. To propose an efficient frequency shifting mechanism for different frame sizes of data under interference conditions to guarantee the reliable data transmission within the delay requirements of the SG. To propose an effective mechanism to guarantee the ZigBee communications within the maximum tolerable delay under the coexistence of WiFi for carrying out effective smart home solutions. To propose an algorithm based on effective transmission power control to increase WSN life time under coexistence scenarios for efficient monitoring and controlling purposes at smart homes. With the introduction of Information and Data-Communication Technology (ICT) to the present electrical power systems, the traditional electrical-grid system is becoming more intelligent and adaptive. The ICT successfully establishes bi-directional communication between Utility companies and the consumer for improving the generation and utilization of power. Wireless Sensor Network (WSN) is efficiently utilized by wide-ranging Smart Grid (SG) applications. Despite many advantages, WSN faces a challenge of avoiding interference experiencing from other coexisting wireless technologies working in the 2.4GHz unlicensed frequency band. Providing support for WSN in terms of avoiding interference is a very challenging issue due to the dynamic wireless communication environment and extremely limited resources. In the present thesis, the problem of interference experienced by WSN in 2.4GHz has been investigated. The challenges, limitations and requirements for avoiding the interference for WSN working in the vicinity of other technologies like WiFi and Bluetooth have been identified. As a result of the literature survey carried out, it was identified that proper channel se-lection and channel prioritization for WSNs working in the coexisting environment had not been adequately developed till then. Hence, there was a requirement for addressing these issues. The proposed schemes in this thesis are based on simulation results obtained.
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Cloud Computing. Strategies For Improving The Performance And Security

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Cloud Computing. Strategies For Improving The Performance And Security

de Parashu Ram Pal e Priyanka Ora

42,20€ + 10% EM CARTÃO

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 Doctoral Thesis / Dissertation from the year 2019 in the subject Computer Science - Internet, New Technologies, , language: English, abstract: Continuous advancement in software field and widespread use of software products many innovative applications have emerged, cloud computing is one of them. In cloud computing users need not to install software they just log in the cloud and pay for their required service. As many users are frequently using cloud computing a big question arises here is the security of user's personal data present at cloud. Therefore, we need to safeguard the data in the midst of untrusted processes. On keeping these issues in mind, a security model is designed in this thesis. The whole model is divided into three sections: one is data encryption, second is secure data storage and the third one is maintenance of data integrity. In first section before uploading the file on cloud, file is encrypted by RSA Partial Homomorphic algorithm. Two keys public and private are generated after encryption. Between these two keys public key is known to all but private key is known to only authorize users. In second section, the data owner uploads the encrypted file moreover with this one access permission list containing names of authorized user and their respective permission. In this model two access permissions (Read Only and Read and Write) are defined by the data owner. In third section the cloud provider calculates hash value of uploaded file using MD5 hash algorithm. This hash value is transferred back to the data owner to use it for verification purpose. As Owner performs verification, hash value of the desired data present at cloud is again calculated. Now this new hash value matches with old hash value which is present at owner end. If it matches no modification is performed, if hash value does not match then some modifications has been performed on the uploaded data. After uploading the file on cloud this file is visible to all users. They can easily download the file but cannot decrypt it as all users don t have private key. Private key is sent to authenticate users by e-mail so that they can get original data. Data modification is controlled by the owner as cloud stores data in encrypted form. The whole architecture is compared with combination of Triple DES and SHA. The results generated by proposed model have shown that it takes less encryption and decryption time as compare to 3DES and SHA combination. Therefore, the proposed model provides better security and maintains data integrity of the uploaded data on cloud.
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