Research Outputs

2019 2019 2018 2018 2017 2017 2016 2016 2015 2015 2014 2014 2013 2013 2012 2012 2011 2011 2010 2010 0.0 0.0 1.0 1.0 2.0 2.0 3.0 3.0 4.0 4.0 5.0 5.0
Now showing 1 - 10 of 23
  • Publication
    Towards a Security Baseline for IaaS-Cloud Back-Ends in Industry 4.0
    The popularity of cloud based Infrastructure-as-a- Service (IaaS) solutions is becoming increasingly popular. However, since IaaS providers and customers interact in a flexible and scalable environment, security remains a serious concern. To handle such security issues, defining a set of security parameters in the service level agreements (SLA) between both, IaaS provider and customer, is of utmost importance. In this paper, the European Network and Information Security Agency (ENISA) guidelines are evaluated to extract a set of security parameters for IaaS. Furthermore, the level of applicability and implementation of this set is used to assess popular industrial and open-source IaaS cloud platforms, respectively VMware and OpenStack. Both platforms provide private clouds, used as backend infrastructures in Industry 4.0 application scenarios. The results serve as initial work to identify a security baseline and research needs for creating secure cloud environments for Industry 4.0.
      171Scopus© Citations 5
  • Publication
    Towards a Security-Aware Benchmarking Framework for Function-as-a-Service
    In a world, where complexity increases on a daily basis the Function-as-a-Service (FaaS) cloud model seams to take countermeasures. In comparison to other cloud models, the fast evolving FaaS increasingly abstracts the underlying infrastructure and refocuses on the application logic. This trend brings huge benefits in application and performance, but comes with difficulties for benchmarking cloud applications. In this position paper, we present an initial investigation of benchmarking FaaS in close to reality production systems. Furthermore, we outline the architectural design including the necessary benchmarking metrics. We also discuss the possibility of using the proposed framework for identifying security vulnerabilities.
      229  1Scopus© Citations 3
  • Publication
    Self-Adaptation Applied to MQTT via a Generic Autonomic Management Framework
    (IEEE, 2019-02) ; ;
    Settanni, Giuseppe 
    ;
    ;
    Delsing, Jerker 
    Manufacturing enterprises are constantly exploring new ways to improve their own production processes to address the increasing demand of customized production. However, such enterprises show a low degree of flexibility, which mainly results from the need to configure new production equipment at design and run time. In this paper we propose self-adaptation as an approach to improve data transmission flexibility in Industry 4.0 environments. We implement an autonomic manager using a generic autonomic management framework, which applies the most appropriate data transmission configuration based on security and business process related requirements, such as performance. The experimental evaluation is carried out in a MQTT infrastructure and the results show that using self-adaptation can significantly improve the trade-off between security and performance. We then propose to integrate anomaly detection methods as a solution to support self-adaptation by monitoring and learning the normal behavior of an industrial system and show how this can be used by the generic autonomic management framework.
      471  1Scopus© Citations 4
  • Publication
    A Multi-Layer and Multi-Tenant Cloud Assurance Evaluation Methodology
    (2015)
    Hudic, A. 
    ;
    ;
    Loruenser, T. 
    ;
    Krotsiani, M. 
    ;
    Spanoudakis, G. 
    ;
    Mauthe, A. 
    ;
    Weippl, E. 
    Data with high security requirements is being processed and stored with increasing frequency in the Cloud. To guarantee that the data is being dealt in a secure manner we investigate the applicability of Assurance methodologies. In a typical Cloud environment the setup of multiple layers and different stakeholders determines security properties of individual components that are used to compose Cloud applications. We present a methodology adapted from Common Criteria for aggregating information reflecting the security properties of individual constituent components of Cloud applications. This aggregated information is used to categorise overall application security in terms of Assurance Levels and to provide a continuous assurance level evaluation. It gives the service owner an overview of the security of his service, without requiring detailed manual analyses of log files.
      153  3Scopus© Citations 8
  • Publication
    Towards Energy-Awareness in Managing Wireless LAN Applications
    (2012) ;
    Bhatti, S. N. 
    ;
    Yu, Y. 
    We have investigated the scope for enabling WLAN applications to manage the trade-off between performance and energy usage. We have conducted measurements of energy usage and performance in our 802.11n WLAN testbed, which operates in the 5 GHz ISM band. We have defined an effective energy usage envelope with respect to application-level packet transmission, and we demonstrate how performance as well as the effective energy usage envelope is effected by various configurations of IEEE 802.11n, including transmission power levels and channel width. Our findings show that the packet size and packet rate of the application flow have the greatest impact on application-level energy usage, compared to transmission power and channel width. As well as testing across a range of packet sizes and packet rates, we emulate a Skype flow, a YouTube flow and file transfers (HTTP over Internet and local server) to place our results in context. Based on our measurements we discuss approaches and potential improvements of management in effective energy usage for the tested applications.
      113  1Scopus© Citations 14
  • Publication
      108  1Scopus© Citations 12
  • Publication
    The Case for Heterogeneous WLAN Environments for Converged Networks
    (2013) ;
    Bhatti, S. N. 
    ;
    Melnikov, N. 
    ;
    Schoenwaelder, J. 
      105  1