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Auflistung nach Autor:in "Pohl, Timo"

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  • Konferenzbeitrag
    Measuring Resource Efficiency of LATEX Paper Templates
    (EnviroInfo 2023, 2023) Pohl, Timo; Ohm, Marc
    Scientific work is mostly communicated via scientific papers, which are often published in journals or conference proceedings, either in print or digital form. These journals and conferences usually demand that submitted papers follow a specific formatting style, for which they provide style templates. The choice of a template influences different properties of the generated document, like its file size or the number of pages that it would use in printed form, directly affecting its impact on the environment. We built a system to automatically compare different LATEX templates with regard to different factors relevant to the environmental impact. We test our approach with seven templates used by different conferences and journals, and find that the most efficient templates have roughly one third of the file size, and require about one half of the resources for paper production of the least efficient templates.
  • Konferenzbeitrag
    Power Consumption of Common Symmetric Encryption Algorithms on Low-Cost Microchips
    (EnviroInfo 2023, 2023) Ohm, Marc; Taufenbach, Lars; Weber, Karsten; Pohl, Timo
    In the Internet of Things (IoT), many devices are battery-operated, making them particularly susceptible to power-hungry applications. Symmetric encryption is a regularly performed task on such devices, as it ensures the confidentiality of the data they send. While previous work has compared the power consumption of common symmetric encryption algorithms on commodity hardware, no such evaluation exists for low-cost microchips, which are often used in IoT devices. In this paper, we compare the power consumption of an ESP8266 executing common symmetric encryption algorithms with varying parameters such as key size, data authentication, or payload size. We find that the power consumption depends on several factors, but that overall AES-GCM has the lowest power consumption when the encrypted data is also authenticated, while Blowfish-CTR has the lowest power consumption when no authentication is applied.
  • Konferenzbeitrag
    You Can Run But You Can’t Hide: Runtime Protection Against Malicious Package Updates For Node.js
    (Sicherheit 2024, 2024) Pohl, Timo; Ohm, Marc; Boes, Felix; Meier, Michael
    Malicious software packages are often used in software supply chain attacks. Detecting these packages is a top priority, and there have been many academic and commercial approaches developed for this purpose. In the event of an attack, it is essential to have resilience against malicious code. To address this issue, we introduce a runtime protection for Node.js that automatically limits the capabilities of packages to a minimum level. The implementation and evaluation of the detection and enforcement of necessary capabilities at runtime was conducted against known malicious attacks. Our approach successfully prevented 90 % of historical attacks with a median install-time overhead of less than 0.6 seconds and a median runtime overhead of less than 0.2 seconds.