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Software-as-a-Service (SaaS) offers several advantages to both service providers and users. Service providers can benefit from the reduction of Total Cost of Ownership (TCO), better scalability, and better resource utilization. On the other hand, users can use the service anywhere and anytime, and minimize upfront investment by following the pay-as-you-go model. Despite the benefits of SaaS, users still have concerns about the security and privacy of their data. Due to the nature of SaaS and the Cloud in general, the data and the computation are beyond the users' control, and hence data security becomes a vital factor in this new paradigm. Furthermore, in multi-tenant SaaS applications, the tenants become more concerned about the confidentiality of their data since several tenants are co-located onto a shared infrastructure.
To address those concerns, we start protecting the data from the provisioning process by controlling how tenants are being placed in the infrastructure. We present a resource allocation algorithm designed to minimize the risk of co-resident tenants called SecPlace. It enables the SaaS provider to control the resource (i.e., database instance) allocation process while taking into account the security of tenants as a requirement.
Due to the design principles of the multi-tenancy model, tenants follow some degree of sharing on both application and infrastructure levels. Thus, strong security-isolation should be present. Therefore, we develop SignedQuery, a technique that prevents one tenant from accessing others' data. We use the Signing Concept to create a signature that is used to sign the tenant's request, then the server can verifies the signature and recognizes the requesting tenant, and hence ensures that the data to be accessed is belonging to the legitimate tenant.
Finally, Data confidentiality remains a critical concern due to the fact that data in the Cloud is out of users' premises, and hence beyond their control. Cryptography is increasingly proposed as a potential approach to address such a challenge. Therefore, we present SecureDB, a system designed to run SQL-based applications over an encrypted database. SecureDB captures the schema design and analyzes it to understand the internal structure of the data (i.e., relationships between the tables and their attributes). Moreover, we determine the appropriate partialhomomorphic encryption scheme for each attribute where computation is possible even when the data is encrypted.
To evaluate our work, we conduct extensive experiments with di↵erent settings. The main use case in our work is a popular open source HRM application, called OrangeHRM. The results show that our multi-layered approach is practical, provides enhanced security and isolation among tenants, and have a moderate complexity in terms of processing encrypted data.
In diesem Papier wird das Konzept eines Lernzentrums für die Informatik (LZI) an der Universität Paderborn vorgestellt. Ausgehend von den fachspezifischen Schwierigkeiten der Informatik Studierenden werden die Angebote des LZIs erläutert, die sich über die vier Bereiche Individuelle Beratung und Betreuung, „Offener Lernraum“, Workshops und Lehrveranstaltungen sowie Forschung erstrecken. Eine erste Evaluation mittels Feedbackbögen zeigt, dass das Angebot bei den Studierenden positiv aufgenommen wird. Zukünftig soll das Angebot des LZIs weiter ausgebaut und verbessert werden. Ausgangsbasis dazu sind weitere Studien.
Lai, Kwok-Wing ; Davis, Niki ; Eickelmann, Birgit ; Erstad, Ola ; Fisser, Petra ; Gibson, David ; Khaddage, Ferial ; Knezek, Gerald ; Webb, Mary
Physical computing covers the design and realization of interactive
objects and installations and allows students to develop concrete,
tangible products of the real world that arise from the learners’
imagination. This way, constructionist learning is raised to a level that
enables students to gain haptic experience and thereby concretizes the
virtual. In this paper the defining characteristics of physical computing
are described. Key competences to be gained with physical computing
will be identified.
KEYCIT 2014
(2015)
Curzon, Paul ; Kalas, Ivan ; Schubert, Sigrid ; Schaper, Niclas ; Barnes, Jan ; Kennewell, Steve ; Bröker, Kathrin ; Kastens, Uwe ; Magenheim, Johannes ; Dagiene, Valentina ; Stupuriene, Gabriele ; Ellis, Jason Brent ; Abreu-Ellis, Carla Reis ; Grillenberger, Andreas ; Romeike, Ralf ; Haugsbakken, Halvdan ; Jones, Anthony ; Lewin, Cathy ; McNicol, Sarah ; Nelles, Wolfgang ; Neugebauer, Jonas ; Ohrndorf, Laura ; Schaper, Niclas ; Schubert, Sigrid ; Opel, Simone ; Kramer, Matthias ; Trommen, Michael ; Pottbäcker, Florian ; Ilaghef, Youssef ; Passig, David ; Tzuriel, David ; Kedmi, Ganit Eshel ; Saito, Toshinori ; Webb, Mary ; Weigend, Michael ; Bottino, Rosa ; Chioccariello, Augusto ; Christensen, Rhonda ; Knezek, Gerald ; Gioko, Anthony Maina ; Angondi, Enos Kiforo ; Waga, Rosemary ; Ohrndorf, Laura ; Or-Bach, Rachel ; Preston, Christina ; Younie, Sarah ; Przybylla, Mareen ; Romeike, Ralf ; Reynolds, Nicholas ; Swainston, Andrew ; Bendrups, Faye ; Sysło, Maciej M. ; Kwiatkowska, Anna Beata ; Zieris, Holger ; Gerstberger, Herbert ; Müller, Wolfgang ; Büchner, Steffen ; Opel, Simone ; Schiller, Thomas ; Wegner, Christian ; Zender, Raphael ; Lucke, Ulrike ; Diethelm, Ira ; Syrbe, Jörn ; Lai, Kwok-Wing ; Davis, Niki ; Eickelmann, Birgit ; Erstad, Ola ; Fisser, Petra ; Gibson, David ; Khaddage, Ferial ; Knezek, Gerald ; Micheuz, Peter ; Kloos, Carlos Delgado
In our rapidly changing world it is increasingly important not only to be an expert in a chosen field of study but also to be able to respond to developments, master new approaches to solving problems, and fulfil changing requirements in the modern world and in the job market. In response to these needs key competencies in understanding, developing and using new digital technologies are being brought into focus in school and university programmes. The IFIP TC3 conference "KEYCIT – Key Competences in Informatics and ICT (KEYCIT 2014)" was held at the University of Potsdam in Germany from July 1st to 4th, 2014 and addressed the combination of key competencies, Informatics and ICT in detail. The conference was organized into strands focusing on secondary education, university education and teacher education (organized by IFIP WGs 3.1 and 3.3) and provided a forum to present and to discuss research, case studies, positions, and national perspectives in this field.
Froitzheim, Manuel ; Bergner, Nadine ; Schroeder, Ulrik ; Hurtienne, Dominik ; Spannagel, Christian ; Roderus, Simon ; Wienkop, Uwe ; Leonhardt, Thiemo ; Kwiecien, Alexandra ; Schmetz, Arno ; Bellgardt, Martin ; Naumann, Uwe ; Weßels, Doris ; Metzger, Christiane ; Längrich, Matthias ; Schulze, Jörg ; Jakoblew, Marcel ; Keil, Reinhard ; Winkelnkemper, Felix ; Engbring, Dieter ; Klar, Tilman-Mathies ; Kujath, Bertold ; Schütze, Christopher ; Fietkau, Julian ; Kindsmüller, Martin Christof ; Göttel, Timo ; Bergner, Nadine ; Taraschewski, Christian ; Vosseberg, Karin ; Czernik, Sofie ; Erb, Ulrike ; Vielhaber, Michael ; Schlierkamp, Kathrin ; Thurner, Veronika ; Bröker, Kathrin
Die Tagung HDI 2014 in Freiburg zur Hochschuldidaktik der Informatik HDI wurde erneut vom Fachbereich Informatik und Ausbildung / Didaktik der Informatik (IAD) in der Gesellschaft für Informatik e. V. (GI) organisiert. Sie dient den Lehrenden der Informatik in Studiengängen an Hochschulen als Forum der Information und des Austauschs über neue didaktische Ansätze und bildungspolitische Themen im Bereich der Hochschulausbildung aus der fachlichen Perspektive der Informatik.
Die HDI 2014 ist nun bereits die sechste Ausgabe der HDI. Für sie wurde das spezielle Motto „Gestalten und Meistern von Übergängen“ gewählt. Damit soll ein besonderes Augenmerk auf die Übergänge von Schule zum Studium, vom Bachelor zum Master, vom Studium zur Promotion oder vom Studium zur Arbeitswelt gelegt werden.