Implementing Shamir's secret sharing scheme using floating point arithmetic would provide a faster and more efficient secret sharing scheme due to the speed in which GPUs perform floating point arithmetic. However, with the loss of a finite field, properties of a perfect secret sharing scheme are not immediately attainable. The goal is to analyze the plausibility of Shamir's secret sharing scheme using floating point arithmetic achieving the properties of a perfect secret sharing scheme and propose improvements to attain these properties. Experiments indicate that property 2 of a perfect secret sharing scheme, "Any k-1 or fewer participants obtain no information regarding the shared secret", is compromised when Shamir's secret sharing scheme is implemented with floating point arithmetic. These experimental results also provide information regarding possible solutions and adjustments. One of which being, selecting randomly generated points from a smaller interval in one of the proposed schemes of this thesis. Further experimental results indicate improvement using the scheme outlined. Possible attacks are run to test the desirable properties of the different schemes and reinforce the improvements observed in prior experiments. / by Timothy Finemore. / Thesis (M.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.

<p><strong>Bakgrund:</strong> Musikindustrin har upplevt omvälvande förändringar det senaste decenniet, där skivbolagen har tappat 50 % av sin försäljning sedan år 2000. Minskningen beror till stor del på det teknologiska paradigmskifte som skett i och med digitaliseringens intåg i musikindustrin, ett intåg som förändrat marknadsvillkoren för berörda parter.</p><p><strong>Syfte: </strong>Syftet är att förstå hur marknadsledande företag påverkas och handlar under teknologiska paradigmskiften, med utgångspunkt från skivbolagsindustrin. Vidare ämnar vi undersöka vad skivbolagen har haft för roll inom musikindustrin och hur den ser ut i dag efter digitaliseringens intåg.</p><p><strong>Metod:</strong> Uppsatsen är baserad på fyra intervjuer samt en e-postkorrenspondens med personer som har upplevt industrins utveckling de senaste åren. Som komplement till intervjuerna används sekundärdata.</p><p><strong>Resultat:</strong> Skivbolagen upplevde svårigheter i och med det teknologiska paradigmskifte som digitaliseringen stod för. Skivbolagen har efter ett defensivt beteende där de motverkat förändringen börjat arbeta för att skapa affärsmodeller som är applicerbara på den digitala marknaden. Studien visar även att skivbolagen har en viktig roll i musikindustrin, då de fungerar som en samordnare för de många funktioner som är involverade i en musikproduktion.</p> / <p><strong>Background: </strong>Music industry has experienced substantial change in the last decade, in which record companies have lost 50% of its sales since the year 2000. The decrease is largely due to the technological paradigm shift that has taken place with the digitalization of the music industry. These changes have changed market conditions for existing companies.</p><p><strong>Aim:</strong> The aim of this study is to understand how market leading companies affects from and act during changes in technological paradigms with a focus on the record industry. Furthermore we will investigate the record companies’ role in the market and what their role is today after the digitalization of the market.</p><p><strong>Method:</strong> This essay is based on four interviews and one e-mail correspondence with people who have experienced the development of industry in the last decade. As complement secondary data has been used.</p><p><strong>Results:</strong> Record companies suffered difficulties due to the technological change of paradigm which was the result of digitalization. After defensive behavior the companies started to create new business models applicable on the digital market. This study also shows that record companies do have an important role in music industry as whole, as they work as a coordinator to the many functions involved in a music production.</p>

<p>Abstract:</p><p>Title: Engelska (Svenska)</p><p>Number of pages: 40 (47 including appendix)</p><p>Author: Carl Strand</p><p>Tutor: Göran Svensson</p><p>Course: Media and Communication Studies C</p><p>Period: Fall 2005</p><p>University: Division of Media and Communication, Department of Information Science, Uppsala University</p><p>Purpose/Aim: The purpose of this essay is to analyze how young people, in the ages 18 to 25, relate to the subject of file sharing, and what their attitudes to this phenomenon are. I aim to describe how they use file sharing, their knowledge about it, how their usage have changed due to the new copyright law, what their stands are on the question of resource control and management on the Internet, and what they think of the future of file sharing.</p><p>Material/Method: The method being used is a qualitative focus group interview model, used to investigate how young people look at the subject of file sharing. The results of the interviews is then applied to a theoretical framework based on thoughts of Denis McQuail, Lawrence Lessig concerning creativity, copyright, resource management and file sharing on the Internet</p><p>Main Results: My conclusion is that the widespread file sharing habits of young people is not only caused by the temptation of getting free stuff, but of the lack of commercial and legal alternatives. Youths are willing to pay for media if the distribution is superior to the illegal file sharing alternative. They are a generation of young people that has grown up in a society where the tendency in many fields has been to make everything faster and more effective. They want to be able to get everything, and they want it fast. They are what I call the Instant Generation.</p><p>Keywords: File sharing, attitudes, focus groups, Darknet, Open Source, free resources, free creativity</p>

AbstractTitle: Swedish social media services (A study about Swedish social media services birth andhow they benefit from the Swedish climate)Number of pages: 38Author: Robin SchwabeggerTutor: Else NygrenCourse: Media and Communication Science CPeriod: Fall 2009University: Division of Informatics and Media, Uppsala University.Purpose/Aim: To see if the Swedish advantage or interest in developing new social mediaservices and networks has anything to do with our society. With society I mean our culture,attitudes and history. Do people, especially young people, have a more positive attitudetowards the Internet and has the fact that we, as a country, were among the first to use theInternet anything to do with it.Material/Method: Data collected from books, newspapers and articles from several sites onthe internet. I’ll use the information I’ve gathered to try to find an answer to my givenproblems for the paper. To mark off my problem and information gathering I’ve decided touse three research questions which my work will circle around.Main Result: You can clearly tell that Sweden has a great climate for social media services tobe created. Sweden, as a country, had access to computers and internet in a very early stageand took great advantage of that. Their culture encourages creativity which is important andpeople in Sweden aren’t afraid to run into problems. Teenagers start uses internet in a veryearly age and they have a higher percent of daily usage then other countries.Keyword: File-sharing, Social media, Sweden, Skype, Spotify, Voddler, The Pirate Bay,Communication, Internet, Culture, Users, Consumers, Developers, Hofstede, Hartley

Bakgrund: Musikindustrin har upplevt omvälvande förändringar det senaste decenniet, där skivbolagen har tappat 50 % av sin försäljning sedan år 2000. Minskningen beror till stor del på det teknologiska paradigmskifte som skett i och med digitaliseringens intåg i musikindustrin, ett intåg som förändrat marknadsvillkoren för berörda parter. Syfte: Syftet är att förstå hur marknadsledande företag påverkas och handlar under teknologiska paradigmskiften, med utgångspunkt från skivbolagsindustrin. Vidare ämnar vi undersöka vad skivbolagen har haft för roll inom musikindustrin och hur den ser ut i dag efter digitaliseringens intåg. Metod: Uppsatsen är baserad på fyra intervjuer samt en e-postkorrenspondens med personer som har upplevt industrins utveckling de senaste åren. Som komplement till intervjuerna används sekundärdata. Resultat: Skivbolagen upplevde svårigheter i och med det teknologiska paradigmskifte som digitaliseringen stod för. Skivbolagen har efter ett defensivt beteende där de motverkat förändringen börjat arbeta för att skapa affärsmodeller som är applicerbara på den digitala marknaden. Studien visar även att skivbolagen har en viktig roll i musikindustrin, då de fungerar som en samordnare för de många funktioner som är involverade i en musikproduktion. / Background: Music industry has experienced substantial change in the last decade, in which record companies have lost 50% of its sales since the year 2000. The decrease is largely due to the technological paradigm shift that has taken place with the digitalization of the music industry. These changes have changed market conditions for existing companies. Aim: The aim of this study is to understand how market leading companies affects from and act during changes in technological paradigms with a focus on the record industry. Furthermore we will investigate the record companies’ role in the market and what their role is today after the digitalization of the market. Method: This essay is based on four interviews and one e-mail correspondence with people who have experienced the development of industry in the last decade. As complement secondary data has been used. Results: Record companies suffered difficulties due to the technological change of paradigm which was the result of digitalization. After defensive behavior the companies started to create new business models applicable on the digital market. This study also shows that record companies do have an important role in music industry as whole, as they work as a coordinator to the many functions involved in a music production.

Abstract: Title: Engelska (Svenska) Number of pages: 40 (47 including appendix) Author: Carl Strand Tutor: Göran Svensson Course: Media and Communication Studies C Period: Fall 2005 University: Division of Media and Communication, Department of Information Science, Uppsala University Purpose/Aim: The purpose of this essay is to analyze how young people, in the ages 18 to 25, relate to the subject of file sharing, and what their attitudes to this phenomenon are. I aim to describe how they use file sharing, their knowledge about it, how their usage have changed due to the new copyright law, what their stands are on the question of resource control and management on the Internet, and what they think of the future of file sharing. Material/Method: The method being used is a qualitative focus group interview model, used to investigate how young people look at the subject of file sharing. The results of the interviews is then applied to a theoretical framework based on thoughts of Denis McQuail, Lawrence Lessig concerning creativity, copyright, resource management and file sharing on the Internet Main Results: My conclusion is that the widespread file sharing habits of young people is not only caused by the temptation of getting free stuff, but of the lack of commercial and legal alternatives. Youths are willing to pay for media if the distribution is superior to the illegal file sharing alternative. They are a generation of young people that has grown up in a society where the tendency in many fields has been to make everything faster and more effective. They want to be able to get everything, and they want it fast. They are what I call the Instant Generation. Keywords: File sharing, attitudes, focus groups, Darknet, Open Source, free resources, free creativity

<p>Abstrakt: Den illegala fildelningen har blivit ett omdiskuterat ämne runt om i världen sedan fildelningstjänsten Napster skapades av unge Shawn Fanning. På senare år har flera nya fildelningstekniker utvecklas och upphovsrättskyddat material delas ut och laddas ner av hundratusentals tals personer runt om i Sverige. Syftet med rapporten är att ge en beskrivning av tekniker och lagar som tillämpas inom illegal fildelning. Samt att beskriva olika aktörer som figurerar inom den illegala fildelningen och vilka åtgärder de tillämpar för att fortsätta och skydda sin verksamhet.</p> / <p>Abstract: Illegal file sharing has become a hot topic around the world. The topic has been heavily discussed since the young Shawn Fanning created the file-sharing service Napster. In recent years many new file sharing technologies has been developed and copyrighted files is now shared and downloaded by hundreds of thousands of peoples in Sweden.</p><p>The thesis purpose is to give a description of technology and laws which are applied in the area of illegal file sharing. And also to describe different actors which appear within the area of illegal file sharing and which measures they apply to continue and protect their activities.</p>

Peer-to-Peer (P2P) overlays were initially proposed for use with wired networks. However, the very rapid proliferation of wireless communication technology has prompted a need for adoption of P2P systems in mobile networks too. There are many common characteristics between P2P overlay networks and Mobile Ad-hoc Networks (MANET). Self-organization, decentralization, a dynamic nature and changing topology are the most commonly shared features. Furthermore, when used together, the two approaches complement each other. P2P overlays provide data storage/retrieval functionality and MANET provides wireless connectivity between clients without depending on any pre-existing infrastructure. P2P overlay networks can be deployed over MANET to address content discovery issues. However, previous research has shown that deploying P2P systems straight over MANET does not exhibit satisfactory performance. Bandwidth limitation, limited resources and node mobility are some of the key constraints. This thesis proposes a novel approach, OneHopOverlay4MANET, to exploit the synergies between MANET and P2P overlays through cross-layering. It combines Distributed Hash Table (DHT) based structured P2P overlays with MANET underlay routing protocols to achieve one logical hop between any pair of overlay nodes. OneHopOverlay4MANET constructs a cross-layer channel to permit direct exchange of routing information between the Application layer, where the overlay operates, and the MANET underlay layer. Consequently, underlay routing information can be shared and used by the overlay. Thus, OneHopOverlay4MANET reduces the typical management traffic when deploying traditional P2P systems over MANET. Moreover, as a result of building one hop overlay, OneHopOverlay4MANET can eliminate the mismatching issue between overlay and underlay and hence resolve key lookups in a short time, enhancing the performance of the overlay. v In this thesis, we present OneHopOverlay4MANET and evaluate its performance when combined with different underlay routing protocols. OneHopOverlay4MANET has been combined with two proactive underlays (OLSR and BATMAN) and with three reactive underlay routing protocols (DSR, AODV and DYMO). In addition, the performance of the proposed system over OLSR has been compared to two recent structured P2P over MANET systems (MA-SP2P and E-SP2P) that adopted OLSR as the routing protocol. The results show that better performance can be achieved using OneHopOverlay4MANET.

Abstrakt: Den illegala fildelningen har blivit ett omdiskuterat ämne runt om i världen sedan fildelningstjänsten Napster skapades av unge Shawn Fanning. På senare år har flera nya fildelningstekniker utvecklas och upphovsrättskyddat material delas ut och laddas ner av hundratusentals tals personer runt om i Sverige. Syftet med rapporten är att ge en beskrivning av tekniker och lagar som tillämpas inom illegal fildelning. Samt att beskriva olika aktörer som figurerar inom den illegala fildelningen och vilka åtgärder de tillämpar för att fortsätta och skydda sin verksamhet. / Abstract: Illegal file sharing has become a hot topic around the world. The topic has been heavily discussed since the young Shawn Fanning created the file-sharing service Napster. In recent years many new file sharing technologies has been developed and copyrighted files is now shared and downloaded by hundreds of thousands of peoples in Sweden. The thesis purpose is to give a description of technology and laws which are applied in the area of illegal file sharing. And also to describe different actors which appear within the area of illegal file sharing and which measures they apply to continue and protect their activities.

Security is essential to communication between entities in the internet. Delay tolerant and disconnected Mobile Ad Hoc Networks (MANET) are a class of networks characterized by high end-to-end path latency and frequent end-to-end disconnections and are often termed as challenged networks. In these networks nodes are sparsely populated and without the existence of a central server, acquiring global information is difficult and impractical if not impossible and therefore traditional security schemes proposed for MANETs cannot be applied. This thesis reports trust management schemes for peer to peer (P2P) application in delay tolerant disconnected MANETs. Properties of a profile based file sharing application are analyzed and a framework for structured P2P overlay over delay tolerant disconnected MANETs is proposed. The framework is implemented and tested on J2ME based smart phones using Bluetooth communication protocol. A light weight Content Driven Data Propagation Protocol (CDDPP) for content based data delivery in MANETs is presented. The CDDPP implements a user profile based content driven P2P file sharing application in disconnected MANETs. The CDDPP protocol is further enhanced by proposing an adaptive opportunistic multihop content based routing protocol (ORP). ORP protocol considers the store-carry-forward paradigm for multi-hop packet delivery in delay tolerant MANETs and allows multi-casting to selected number of nodes. Performance of ORP is compared with a similar autonomous gossiping (A/G) protocol using simulations. This work also presents a framework for trust management based on dynamicity aware graph re-labelling system (DA-GRS) for trust management in mobile P2P applications. The DA-GRS uses a distributed algorithm to identify trustworthy nodes and generate trustable groups while isolating misleading or untrustworthy nodes. Several simulations in various environment settings show the effectiveness of the proposed framework in creating trust based communities. This work also extends the FIRE distributed trust model for MANET applications by incorporating witness based interactions for acquiring trust ratings. A witness graph building mechanism in FIRE+ is provided with several trust building policies to identify malicious nodes and detect collusive behaviour in nodes. This technique not only allows trust computation based on witness trust ratings but also provides protection against a collusion attack. Finally, M-trust, a light weight trust management scheme based on FIRE+ trust model is presented.