The Internet of Things has become the next big step of a general Internetevolution, and conveys the assurance of security as one of the biggest challenge.In particular, use cases and application scenarios that adopt groupcommunication schemes need to be properly secured, in order to protect themessage exchange among group members from a number of security attacks.A typical way to achieve secure group communication relies on the adoptionof a symmetric group key shared among all the group members. This in turnrequires to rely on a group key management scheme, which is responsible forrevoking and renewing the group key when nodes join or leave the group.Due to the resource-constrained nature of typical IoT devices, the adoptedgroup key management scheme should be ecient and highly scalable withthe group size.This thesis project has been conducted in collaboration with SICS SwedishICT, a research institute with focus on applied computer science. We haveimplemented an ecient group key management protocol initially proposedand designed by SICS, considering the Contiki operating system and resourceconstrainedIoT platforms. We have also experimentally evaluated the protocolin terms of storage overhead, communication overhead, energy consumptionand total required rekeying time. / Internet of Things har blivit nästa stora steg i en generell utveckling avInternet, där en av de största utmaningarna är att garantera säkerhet.Speciellt användningsfall och applikationsscenarion som använder metoderför gruppkommunikation måste vara ordentligt säkrade, för att kunna skyddautbyte av meddelanden mellan gruppens medlemmar från ett antal attackscenarion.Ett vanligt sätt att uppnå säker gruppkommunikation baseras på användningav en symmetrisk gruppnyckel som delas av alla gruppens medlemmar.Detta i sin tur gör det nödvändigt att förlita sig på ett system för hanteringav gruppnycklar, vilket är ansvarigt för återkallning och förnyelse av nycklarnär noder går med i eller lämnar gruppen.På grund av att typiska IoT enheter har begränsade resurser måste metodensom används för hantering av gruppnycklar vara eektiv och mycketskalbar med gruppstorleken.Denna masteruppsats har utförts i samarbetet med SICS Swedish ICT,ett forskningsinstitut med fokus på applicerad datavetenskap. Vi har implementeratett eektiv protokoll för hantering av gruppnycklar ursprungligenframtaget och designat av SICS, med operativsystemet Contiki och resursbegränsade IoT-plattformar i åtanke. Vi har också experimentellt utvärderatprotokollet med hänsyn till overhead för datalagring, overhead för kommunikation,energikonsumtion och den totala tiden som krävs för förnyelse avnycklar.

The Internet of Things and connected devices has been getting more and more recognition in multiple industries the last few years. At the same time, the gathering of data is withholding a more central role for both companies and civilians. One type of Internet of Things is enabled by telecommunication Service Providers(TSP)providing SIMcards in devices, functioning by an advanced telecommunication infrastructure. This study aims to examine how these TSPs can leverage data generated by the communication infrastructure, by providing an additional data-as-a-service (DaaS) to current customers. The study was done at a global TSP within the area of SIM-fleet management/IoT enablement. The number of industries that are starting to connect devices are growing extensively, to get all types of information regarding the devices ranging from electricity-usage & geocoordinates to performance or other useful information. The data that is sent by the SIM-card belongs to the customer, and the TSPs does not access it. However, the telecommunication infrastructure generates data created by the communication of the devices, which is gathered by the TSP. Since a huge amount of data is attained by the TSP offering the infrastructure, the aim for this study is to examine eventual obstacles and opportunities of a DaaSoffering. How the data is to be delivered, customers connectivity-needs and how current insights streams are delivered are examples of subjects the study will examine. The work has its foundation in a theoretical reference frame and a qualitative empirical study. The theoretical reference provides a theoretical overview of the industry's development and earlier research within the area. It was created by conducting a literature study combined with reports provided by trade organizations and other stakeholders. The empirical study contains 6 interviews with employees at a global TSP, with an extensive history of connected devices. The two parts were then compiled in order to compare the result with the theoretical background. It appeared that a lot of the challenges of developing a DaaS from the result agreed with the theoretical reference frame. The customers' differences in connectivity-maturity was shown to pose a great challenge to standardize a DaaS-offering, and the clients analytical needs were dependent on the same premises. Furthermore DaaS is considered to have a great effect on the industry's future development, / Internet of Things och uppkopplade produkter har blivit ett allt vanligare begrepp inom flertalet branscher. Samtidigt har datainsamling blivit en mer central del av alltifrån affärsmodeller till något vanliga konsumenter har i åtanke. En variant av Internet of Things tillhandahålls genom SIM-kort i produkter, som tillhandahålls av operatörer, och funktionerar genom kommunikationsnätverk. Denna studie är en akademisk utredning kring hur dessa operatörer kan utnyttja data genererat från telekommunikations-infrastruktur till en tjänst för nuvarande kunder. Studien är utförd hos en global operatör inom området av SIM-fleet Management/IoT-enablement. Fler och fler industrier går mot att koppla upp produkter för att få information kring alltifrån prestanda, elanvändning hos produkten, geografisk position eller annan information som önskas. Den data som skickas tillhandahålls av kund, vilket operatören inte har någon tillgång till. Dock så genererar kommunikationen i sig data genom kommunikationsnätverket, som operatören samlar in. I och med att mängder av data blir tillgänglig för operatörerna som tillhandahåller infrastrukturen, är syftet med denna rapport att undersöka eventuella hinder och möjligheter att erbjuda kunder ytterligare data som en tjänst i sig. Hur datan ska levereras, kundernas analysbehov och hur nuvarande insikter levereras är några exempel på det studien utreder. Arbetet grundar sig i en litteraturstudie och en kvalitativ empirisk studie. Litteraturstudien ger en bakgrund och teoretisk överblick kring branschens utveckling och litteraturens syn på området. Detta gjordes genom vetenskapliga publikationer samt diverse rapporter från branschorganisationer och intressenter. Den empiriska studien genomfördes genom 6 intervjuer med anställda på en global operatör med lång historisk inom uppkopplade produkter. De två delarna sammanställdes sedan för att jämföra resultatet med den teoretiska bakgrunden. Det visades sig vara mycket i resultat som stämde överens med de teoretiska aspekterna kring utmaningar med att erbjuda Data-as-aService (DaaS). Kundernas olika mognadsgrad i sin uppkoppling visades sig vara en stor utmaning i att standardisera en DaaS, och kundernas analysbehov gick ofta isär på samma premisser. Vidare anses DaaS ha stor påverkan på hur branschen fortsätter utvecklas i framtiden, och konsensus är tjänsten i framtiden kommer bli mer och mer datadriven.

Earthquakes pose a significant threat as one of the most destructive natural disasters globally. Despite ongoing efforts to predict earthquakes, the success of such research remains a challenge, necessitating interdisciplinary research and collaboration. The EU-funded Project artEmis seeks to address this challenge in earthquake-prone regions of Europe by establishing a multi-sensor Internet of Things (IoT) network to monitor radon gas concentration in groundwater near fault lines. This thesis focuses on supporting the project by developing the software interface for the transmission of data from a gateway controller to the cloud interface, addressing key functionalities. The goal is to establish two-way communication between the gateway controller and the cloud using the MQTT-SN protocol. Additionally, other functionalities such as data storage and sensor data anomaly detection are also explored and implemented. This research employs an applied research approach, consisting of literature reviews, development, and evaluation phases. The development phase consists of the design and implementation of memory storage, data generation, and bi-directional communication features which align with the project goals. The evaluation of the software development process is achieved through a comprehensive set of functional and end-to-end tests. These tests examine the intricacies of the different software components, with rigorous evaluation against all test criteria and project requirements. The evaluation process concluded with a favourable outcome, indicating that all tests were successful. Additionally, a detailed evaluation of memory capacity was conducted to understand the system’s data retention capability, alongside an analysis of throughput and latency. The memory evaluation demonstrated efficient allocation within the processor’s memory, offering 2.7 days of data storage with specific intervals. Throughput analysis revealed a positive correlation between larger data packets and increased transfer rates, and latency increased with larger packets, possibly due to network congestion and processing delays. However, it is important to acknowledge several inherent limitations in this work, including constrained bi-directional communication capabilities, the absence of a serial interface with sensors, limitations in report size, and constraints on storage capacity. These factors serve as essential contextual considerations for the scope and capabilities of our project. In summary, this research supports Project artEmis by developing a vital software interface for the IoT network. Successful evaluation of the software through comprehensive testing signifies a significant step forward in earthquake monitoring. Despite certain limitations, this work contributes to enhancing our understanding and response to seismic threats. / Jordbävningar utgör ett betydande hot som en av de mest förödande naturliga katastroferna globalt sett. Trots pågående ansträngningar att förutsäga jordbävningar förblir framgången för sådan forskning en utmaning, vilket kräver tvärvetenskaplig forskning och samarbete. Det EU-finansierade projektet artEmis syftar till att belysa detta problem i jordbävningsbenägna regioner i Europa genom att etablera ett multisensor Internet of Things (IoT)-nätverk för att övervaka radongaskoncentrationen i grundvatten nära förkastningslinjer. Denna uppsats fokuserar på att stödja projektet genom att utveckla programvarugränssnittet för överföring av data från en gateway-controller till molngränssnittet samt upplyser viktiga funktioner. Målet är att etablera tvåvägskommunikation mellan gateway-controllern och molnet med hjälp av MQTT-SN-protokollet. Dessutom utforskas och implementeras även andra funktioner, såsom datalagring och detektering av avvikelser i sensordata. Denna forskning använder en tillämpad forskningsmetod som består av litteraturstudier, utveckling och utvärderingsfaser. Utvecklingsfasen innefattar design och implementering av funktioner för minneslagring, datagenerering och tvåvägskommunikation som överensstämmer med projektets mål. Utvärderingen av programvaruutvecklingsprocessen uppnås genom omfattande funktionella och slutanvändartester. Dessa tester granskar de olika programvarukomponenternas komplexiteter och utvärderas noggrant mot alla testkriterier och projektets krav. Utvärderingsprocessen avslutades med ett gynnsamt resultat, vilket indikerar att alla tester var framgångsrika. Dessutom gjordes en detaljerad utvärdering av minneskapaciteten för att förstå systemets datalagringsförmåga, tillsammans med en analys av genomströmning och latens. Minnesutvärderingen visade på effektiv allokering i processorns minne och erbjöd 2,7 dagars datalagring med specifika intervall. Genomströmningsanalys avslöjade en positiv korrelation mellan större datapaket och ökade överföringshastigheter, och latensen ökade med större paket, möjligen på grund av nätverksstockning och bearbetningsförseningar. Det är dock viktigt att erkänna att det finns flera begränsningar i forskningen, inklusive begränsade tvåvägskommunikationsmöjligheter, begränsningar i rapportstorlek och lagringskapacitet, och ett saknande av seriellt gränssnitt med sensorer. Dessa faktorer är viktiga för förståelsen av omfattningen och förmågorna hos vårt projekt. Sammanfattningsvis stöder denna forskning Project artEmis genom att utveckla en avgörande programvarugränssnitt för IoT-nätverket. Den framgångsrika utvärderingen av programvaran genom omfattande tester har lett till ett betydande steg framåt inom jordbävningsövervakning. Trots vissa begränsningar bidrar detta arbete till att förbättra vår förståelse och förmåga att reagera på seismiska händelser.

<p dir="ltr">The Internet of Things (IoT) systems include sensors that measure the physical world, actuators that influence it, and IoT apps that automate these sensors and actuators. Although IoT environments have revolutionized our lives by integrating digital connectivity into physical processes, they also introduce unique security and privacy concerns. Particularly, these systems include multiple components that are unified through the cyber and physical domains. For instance, smart homes include various devices and multiple IoT apps that control these devices. Thus, attacks against any single component can have rippling effects, amplifying due to the composite behavior of sensors, actuators, apps, and the physical environment.</p><p dir="ltr">In this dissertation, I explore the emerging security and privacy issues that arise from the complex physical interactions in IoT environments. To discover and mitigate these emerging issues, there is a need for composite reasoning techniques that consider the interplay between digital and physical domains. This dissertation addresses these challenges to build secure IoT environments and enhance user privacy with new formal techniques and systems.</p><p dir="ltr">To this end, I first describe my efforts in ensuring the safety and security of IoT en- vironments. Particularly, I introduced IoTSeer, a security service that discovers physical interaction vulnerabilities among IoT apps. I then proposed attacks that evade prior event verification systems by exploiting the complex physical interactions between IoT sensors and actuators. To address them, I developed two defenses, software patching and sensor placement, to make event verification systems robust against evasion attacks. These works provide a suite of tools to achieve compositional safety and security in IoT environments. </p><p dir="ltr">Second, I discuss my work that identifies the privacy risks of emerging IoT devices. I designed DMC-Xplorer to find vulnerabilities in voice assistant platforms and showed that an adversary can eavesdrop on privacy-sensitive device states and prevent users from controlling devices. I then developed a remote side-channel attack against intermittent devices to infer privacy-sensitive information about the environment in which they are deployed. These works highlight new privacy issues in emerging commodity devices used in IoT environments.</p>

Det finns en brist på oberoende forskning som jämför Redpandas kapacitet med etablerade alternativ som Apache Kafka, särskilt i IoT-sammanhang där resurseffektivitet är avgörande. Detta arbete jämför prestandan hos de två plattformarna i realtidsdataapplikationer under förhållanden som liknar de i IoT-miljöer. Genom en egenutvecklad applikation genomfördes prestandatester i en lokal containeriserad miljö för att utvärdera genomströmningshastighet och latens vid olika meddelandestorlekar och antal partitioner. Studien visar att Redpanda överträffar Kafka vid mindre meddelandestorlekar, med högre genomströmningshastighet och lägre latens, särskilt vid högre antal partitioner. Däremot utmärker sig Kafka vid större meddelandestorlekar genom att uppnå högre genomströmningshastighet, men med ökad latens. Resultaten indikerar att Redpanda är väl lämpad för IoT-applikationer som kräver snabb hantering av små meddelanden, medan Kafka är mer effektiv för scenarier som involverar större datamängder. Fynden betonar vikten av att välja rätt plattform baserat på specifika applikationsbehov, vilket bidrar med värdefulla insikter inom IoT och realtidsdatahantering. / There is a lack of independent research comparing the capacity of Redpanda to established alternatives like Apache Kafka, particularly in IoT contexts where resource efficiency is critical. This thesis compares the performance of the two platforms in real-time data applications under conditions similar to those in IoT environments. Through a custom-developed application, performance tests were conducted in a local containerized environment to evaluate throughput and latency across various message sizes and partition counts. The study finds that Redpanda outperforms Kafka with smaller message sizes, offering higher throughput and lower latency, particularly at higher partition counts. Conversely, Kafka excels with larger message sizes, achieving higher throughput but with increased latency. The results indicate that Redpanda is well-suited for IoT applications requiring rapid handling of small messages, while Kafka is more efficient for scenarios involving larger data volumes. The findings emphasize the importance of selecting the appropriate platform based on specific application needs, thus contributing valuable insights in IoT and real-time data streaming.

Along with rapid development of sensing and communication technology, Internet of Things (IoTs) has enabled a tremendous number of applications in health care, agriculture, and industry. As the fundamental element, the wireless sensing node, such as radio tags need to be operating under micro power level for energy autonomy. The evolution of electronics towards highly energy-efficient systems requires joint efforts in developing innovative architectures and circuit techniques. In this dissertation, we explore ultra-low power circuits and systems for micropower wireless sensing in the context of IoTs, with a special focus on radio interfaces and sensor interfaces. The system architecture of UHF/UWB asymmetric radio is introduced firstly. The active UWB radio is employed for the tag-to-reader communication while the conventional UHF radio is used to power up and inventory the tag. On the tag side, an ultra-low power, high pulse swing, and power scalable UWB transmitter is studied. On the reader side, an asymmetric UHF/UWB reader is designed. Secondly, to eliminate power-hungry frequency synthesis circuitry, an energy-efficient UWB transmitter with wireless clock harvesting is presented. The transmitter is powered by an UHF signal wirelessly and respond UWB pulses by locking-gating-amplifying the sub-harmonic of the UHF signal. 21% locking range can be achieved to prevent PVT variations with -15 dBm injected power. Finally, radio-sensing interface co-design is explored. Taking the advantage of RC readout circuit and UWB pulse generator, the sensing information is directly extracted and transmitted in the time domain, exploiting high time-domain resolution UWB pulses. It eliminates the need of ADC of the sensor interface, meanwhile, reduces the number of bits to be transmitted for energy saving. The measurement results show that the proposed system exhibits 7.7 bits ENOB with an average relative error of 0.42%. / <p>QC 20160412</p>

Internet of things (IoT) generates massive amount of heterogeneous data, which should be efficiently utilized to support services in different domains. Specifically, data need to be supplied to services by understanding the needs of services and by understanding the environment changes, so that necessary data can be provided efficiently but without overfeeding. However, it is still very difficult for IoT to fulfill such data supply with only the existing supports of communication, network, and infrastructure; while the most essential issues are still unaddressed, namely the heterogeneity issue, the recourse coordination issue, and the environments’ dynamicity issue. Thus, this necessitates to specifically study on those issues and to propose a method to utilize the massive amount of heterogeneous data to support services in different domains. This dissertation presents a novel method, called the data-centric network of things (DNT), which handles heterogeneity, coordinates resources, and understands the changing IoT entity relations in dynamic environments to supply data in support of services. As results, various services based on IoT (e.g., smart cities, smart transport, smart healthcare, smart homes, etc.) are supported by receiving enough necessary data without overfeeding. The contributions of the DNT to IoT and big data research are: firstly the DNT enables IoT to perceive data, resources, and the relations among IoT entities in dynamic environments. This perceptibility enhances IoT to handle the heterogeneity in different levels. Secondly, the DNT coordinates IoT edge resources to process and disseminate data based on the perceived results. This releases the big data pressure caused by centralized analytics to certain degrees. Thirdly, the DNT manages entity relations for data supply by handling the environment dynamicity. Finally, the DNT supply necessary data to satisfy different service needs, by avoiding either data-hungry or data-overfed status.

The new technological phenomenon Internet of Things (IoT) is steadily growing and has become more incorporated into our daily lives. The technology can be found in a variety of applications in today's society and has helped to simplify and streamline tasks and processes. Analysts estimate that the market for IoT could potentially be worth 11 billion dollars by 2025. Large technology corporations are spending a vast amount of money to promote their IoT products, but we are also seeing companies which normally are not associated with IT making an entrance to make their products connected. During the fall of 2016 media reported about a big security breach within the IoT that affected security cameras and forced them to commit denial of service attacks. This event led us to take a closer look at the IoT and the security around the products. The aim of this study is to investigate how developers and security experts working with IoT perceive the current state of security and the possible threats and risks we face when using the technology. For this study we have used a qualitative approach with semi-structured interviews. A total of eight interviews were conducted equally divided between developers and security experts. Our results show that a common denominator between the respondents' answers was that the lack of standardization and platforms for IoT-applications is a problem. However, a unified security solution is currently unattainable due to the vast number of platforms present in IoT today. Therefore, the use of a standard or platform does not guarantee security. Also, with the increasing popularity of IoT, products from developers without the proper knowledge is becoming a serious security concern for the IoT.

<p>U doktorskoj disertaciji razmatrana je mogućnost lokalizacije proizvoda primenom tehnologija Interneta stvari. Postavljen je model za lokalizaciju proizvoda koji primenjuje RFID tehnologiju i bežične senzorske mreže. U okviru modela, predložen je i realizovan hibridni metod za lokalizaciju proizvoda koji kombinuje podatke dobijene metodom najbližih suseda i metodom optimizacije rojem čestica, a zatim i hibridni metod za lokalizaciju proizvoda koji kombinuje podatke dobijene u RFID sistemu i u bežičnoj senzorskoj mreži. Mogućnosti primene predloženog modela su eksperimentalno ispitane u simuliranim sistemima i u laboratorijskoj okolini sa industrijskim elementima..</p> / <p>This dissertation discusses the possibilities of product localization based on Internet of things technologies. A model for product localization has been proposed based on RFID technology and wireless sensor networks. Within the model, a hybrid localization method which combines outputs from nearest neighbours method and particle swarm optimization for product localization has been proposed and developed, followed by a hybrid localization method which combines data from RFID system and wireless sensor network. The application possibilities for the proposed model have been experimentally tested in simulated systems and in laboratory conditions with industrial elements.</p>

Aus der Einführung "Durch die Vernetzung von Produkten im Internet der Dinge / Internet of Things (IoT) und die damit einhergehende Verfügbarkeit von Daten, können nicht nur Produkte selbstständig agieren, reagieren und Aktionen auslösen, sondern auch externe Empfänger die von ihnen gelieferten Daten auswerten und für zusätzliche Services nutzen (Eisenhauer 2007, Abramovici et al. 2014). Dies birgt unter Anderem enorme Potentiale bei der Instandhaltung von technischen Anlagen (Wohlgemut 2007). Diese Anlagen oder Produktionsstätten sind in aller Regel komplexe Systeme, die aus einer heterogenen Landschaft von Subsystemen bestehen. Ohne vorhergehende Kenntnisse einer Maschine ist die Analyse oder Überprüfung solcher Systeme schwierig bis unmöglich. Weiterhin stehen die technischen Dokumentationen und Wartungshistorien bei solchen Tätigkeiten häufig nicht vollständig oder nur in Papierform vor Ort zur Verfügung, während der aktuelle Status der Anlage nicht mit den vorhandenen Informationen überlagert werden kann. ..."