The Experts below are selected from a list of 7494 Experts worldwide ranked by ideXlab platform

Atul Prakash - One of the best experts on this subject based on the ideXlab platform.

  • Security Analysis of Emerging Smart Home Applications
    Symposium on Security and Privacy, 2016
    Co-Authors: Earlence Fernandes, Jaeyeon Jung, Atul Prakash
    Abstract:

    —Recently, several competing smart home program-ming frameworks that support third party app development have emerged. These frameworks provide tangible benefits to users, but can also expose users to significant security risks. This paper presents the first in-depth empirical security analysis of one such emerging smart home programming platform. We analyzed Samsung-owned SmartThings, which has the largest number of apps among currently available smart home platforms, and supports a broad range of devices including motion sensors, Fire Alarms, and door locks. SmartThings hosts the application runtime on a proprietary, closed-source cloud backend, making scrutiny challenging. We overcame the challenge with a static source code analysis of 499 SmartThings apps (called SmartApps) and 132 device handlers, and carefully crafted test cases that revealed many undocumented features of the platform. Our key findings are twofold. First, although SmartThings implements a privilege separation model, we discovered two intrinsic design flaws that lead to significant overprivilege in SmartApps. Our analysis reveals that over 55% of SmartApps in the store are overprivileged due to the capabilities being too coarse-grained. Moreover, once installed, a SmartApp is granted full access to a device even if it specifies needing only limited access to the device. Second, the SmartThings event subsystem, which devices use to communicate asynchronously with SmartApps via events, does not sufficiently protect events that carry sensitive information such as lock codes. We exploited framework design flaws to construct four proof-of-concept attacks that: (1) secretly planted door lock codes; (2) stole existing door lock codes; (3) disabled vacation mode of the home; and (4) induced a fake Fire Alarm. We conclude the paper with security lessons for the design of emerging smart home programming frameworks.

Aeza F. Javie - One of the best experts on this subject based on the ideXlab platform.

  • Temperature and moisture effects on electrical resistance and strain sensitivity of smart concrete
    'Elsevier BV', 2019
    Co-Authors: Demircilioğlu Erma, Teomete Egeme, Schlange Erik, Aeza F. Javie
    Abstract:

    Cement composites, with enhanced electrical properties, have been investigated as multifunctional composites, with application as strain sensors, heating elements or anode in different electrochemical technique. In this work, several aspects regarding the practical application of smart concrete with the addition of brass fibers have been addressed. In general, electrical conductivity of cement composites is dependent on their moisture content and temperature. Therefore, for a real use of this type of sensors the influence of these parameters should be determined. The electrical resistance of the smart concrete decreased linearly with temperature up to 50 °C, therefore this effect can be compensated in strain sensing applications. On the other hand, at higher temperatures, especially after 150 °C, the mismatch strain between brass fibers, cement paste and aggregates resulted in damage, which was detected as an increase of the electrical resistance on the order of 613%. Thus, smart concrete can be used as Fire Alarm sensor. Also, the relationship between moisture and electrical resistance change was determined. After curing, the samples with moisture content of 5.2% were put in an electric furnace at 90 °C. After 60 min of 90 °C exposure the minimum resistance was measured as 702 Ohm for an average moisture content of 4.8%. At this optimal moisture content, water between fibers was lost and direct contact between fibers was achieved, maximizing the electrical conductivity of the composite. After this point, when the smart concrete was heated for a longer time, the electrical resistance increased almost 300% because water acting as electrolyte was lost. Thus, smart concrete is sensitive to moisture change and can be used as moisture sensor, especially at constructions exposed to harmful water. The effect of moisture content on the strain sensitivity of smart concrete was tested. The mechanism relating piezoresistive properties and moisture content were enlightened. Multifunctional smart concrete can be used as strain, Fire and moisture sensor while acting as a load bearing element.This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) through Grant no: 213M452 entitled ‘‘Smart Concrete Production”

  • Temperature and moisture effects on electrical resistance and strain sensitivity of smart concrete
    'Elsevier BV', 2019
    Co-Authors: Demircilioğlu Erma, Teomete Egeme, Schlange E., Aeza F. Javie
    Abstract:

    Cement composites, with enhanced electrical properties, have been investigated as multifunctional composites, with application as strain sensors, heating elements or anode in different electrochemical technique. In this work, several aspects regarding the practical application of smart concrete with the addition of brass fibers have been addressed. In general, electrical conductivity of cement composites is dependent on their moisture content and temperature. Therefore, for a real use of this type of sensors the influence of these parameters should be determined. The electrical resistance of the smart concrete decreased linearly with temperature up to 50 °C, therefore this effect can be compensated in strain sensing applications. On the other hand, at higher temperatures, especially after 150 °C, the mismatch strain between brass fibers, cement paste and aggregates resulted in damage, which was detected as an increase of the electrical resistance on the order of 613%. Thus, smart concrete can be used as Fire Alarm sensor. Also, the relationship between moisture and electrical resistance change was determined. After curing, the samples with moisture content of 5.2% were put in an electric furnace at 90 °C. After 60 min of 90 °C exposure the minimum resistance was measured as 702 Ohm for an average moisture content of 4.8%. At this optimal moisture content, water between fibers was lost and direct contact between fibers was achieved, maximizing the electrical conductivity of the composite. After this point, when the smart concrete was heated for a longer time, the electrical resistance increased almost 300% because water acting as electrolyte was lost. Thus, smart concrete is sensitive to moisture change and can be used as moisture sensor, especially at constructions exposed to harmful water. The effect of moisture content on the strain sensitivity of smart concrete was tested. The mechanism relating piezoresistive properties and moisture content were enlightened. Multifunctional smart concrete can be used as strain, Fire and moisture sensor while acting as a load bearing element.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and Environmen

Earlence Fernandes - One of the best experts on this subject based on the ideXlab platform.

  • Security Analysis of Emerging Smart Home Applications
    Symposium on Security and Privacy, 2016
    Co-Authors: Earlence Fernandes, Jaeyeon Jung, Atul Prakash
    Abstract:

    —Recently, several competing smart home program-ming frameworks that support third party app development have emerged. These frameworks provide tangible benefits to users, but can also expose users to significant security risks. This paper presents the first in-depth empirical security analysis of one such emerging smart home programming platform. We analyzed Samsung-owned SmartThings, which has the largest number of apps among currently available smart home platforms, and supports a broad range of devices including motion sensors, Fire Alarms, and door locks. SmartThings hosts the application runtime on a proprietary, closed-source cloud backend, making scrutiny challenging. We overcame the challenge with a static source code analysis of 499 SmartThings apps (called SmartApps) and 132 device handlers, and carefully crafted test cases that revealed many undocumented features of the platform. Our key findings are twofold. First, although SmartThings implements a privilege separation model, we discovered two intrinsic design flaws that lead to significant overprivilege in SmartApps. Our analysis reveals that over 55% of SmartApps in the store are overprivileged due to the capabilities being too coarse-grained. Moreover, once installed, a SmartApp is granted full access to a device even if it specifies needing only limited access to the device. Second, the SmartThings event subsystem, which devices use to communicate asynchronously with SmartApps via events, does not sufficiently protect events that carry sensitive information such as lock codes. We exploited framework design flaws to construct four proof-of-concept attacks that: (1) secretly planted door lock codes; (2) stole existing door lock codes; (3) disabled vacation mode of the home; and (4) induced a fake Fire Alarm. We conclude the paper with security lessons for the design of emerging smart home programming frameworks.

Lošek Václav - One of the best experts on this subject based on the ideXlab platform.

  • Security of a selected building using KARS method
    'Springer Science and Business Media LLC', 2019
    Co-Authors: Enešová Kristýna, Pe Svoboda, Rak Jakub, Lošek Václav
    Abstract:

    This article is focused on securing a building that has been selected in the Czech Republic. The aim of the thesis is to analyze risks and propose measures. The first part of the article introduces security issues with a special focus on intrusion detectors, Fire detection and Fire-Alarm systems, and last but not least electronic security systems. Furthermore, it deals with the characteristics of the building and a subsequent analysis by means of the KARS method. The measures proposed are referred to in the conclusion for improving the current situation. The results of the research allow for the implementation of the proposals into practice. © Springer Nature Switzerland AG 2019

  • Security of a selected building using KARS method
    'World Scientific and Engineering Academy and Society (WSEAS)', 2019
    Co-Authors: Enešová Kristýna, Pe Svoboda, Rak Jakub, Lošek Václav
    Abstract:

    This article is focused on securing a building that has been selected in the Czech Republic. The aim of the thesis is to analyze risks and propose security measures. The first part of the article introduces security issues with a special focus on intrusion detectors, Fire detection and Fire-Alarm systems, and last but not least electronic security systems. Furthermore, it deals with the characteristics of the building and a subsequent analysis using the KARS method. The measures proposed are referred to in the conclusion for improving the current situation. The results of the research allow for the implementation of the proposals into practice. © 2018, World Scientific and Engineering Academy and Society. All rights reserved

Demircilioğlu Erma - One of the best experts on this subject based on the ideXlab platform.

  • Temperature and moisture effects on electrical resistance and strain sensitivity of smart concrete
    'Elsevier BV', 2019
    Co-Authors: Demircilioğlu Erma, Teomete Egeme, Schlange Erik, Aeza F. Javie
    Abstract:

    Cement composites, with enhanced electrical properties, have been investigated as multifunctional composites, with application as strain sensors, heating elements or anode in different electrochemical technique. In this work, several aspects regarding the practical application of smart concrete with the addition of brass fibers have been addressed. In general, electrical conductivity of cement composites is dependent on their moisture content and temperature. Therefore, for a real use of this type of sensors the influence of these parameters should be determined. The electrical resistance of the smart concrete decreased linearly with temperature up to 50 °C, therefore this effect can be compensated in strain sensing applications. On the other hand, at higher temperatures, especially after 150 °C, the mismatch strain between brass fibers, cement paste and aggregates resulted in damage, which was detected as an increase of the electrical resistance on the order of 613%. Thus, smart concrete can be used as Fire Alarm sensor. Also, the relationship between moisture and electrical resistance change was determined. After curing, the samples with moisture content of 5.2% were put in an electric furnace at 90 °C. After 60 min of 90 °C exposure the minimum resistance was measured as 702 Ohm for an average moisture content of 4.8%. At this optimal moisture content, water between fibers was lost and direct contact between fibers was achieved, maximizing the electrical conductivity of the composite. After this point, when the smart concrete was heated for a longer time, the electrical resistance increased almost 300% because water acting as electrolyte was lost. Thus, smart concrete is sensitive to moisture change and can be used as moisture sensor, especially at constructions exposed to harmful water. The effect of moisture content on the strain sensitivity of smart concrete was tested. The mechanism relating piezoresistive properties and moisture content were enlightened. Multifunctional smart concrete can be used as strain, Fire and moisture sensor while acting as a load bearing element.This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) through Grant no: 213M452 entitled ‘‘Smart Concrete Production”

  • Temperature and moisture effects on electrical resistance and strain sensitivity of smart concrete
    'Elsevier BV', 2019
    Co-Authors: Demircilioğlu Erma, Teomete Egeme, Schlange E., Aeza F. Javie
    Abstract:

    Cement composites, with enhanced electrical properties, have been investigated as multifunctional composites, with application as strain sensors, heating elements or anode in different electrochemical technique. In this work, several aspects regarding the practical application of smart concrete with the addition of brass fibers have been addressed. In general, electrical conductivity of cement composites is dependent on their moisture content and temperature. Therefore, for a real use of this type of sensors the influence of these parameters should be determined. The electrical resistance of the smart concrete decreased linearly with temperature up to 50 °C, therefore this effect can be compensated in strain sensing applications. On the other hand, at higher temperatures, especially after 150 °C, the mismatch strain between brass fibers, cement paste and aggregates resulted in damage, which was detected as an increase of the electrical resistance on the order of 613%. Thus, smart concrete can be used as Fire Alarm sensor. Also, the relationship between moisture and electrical resistance change was determined. After curing, the samples with moisture content of 5.2% were put in an electric furnace at 90 °C. After 60 min of 90 °C exposure the minimum resistance was measured as 702 Ohm for an average moisture content of 4.8%. At this optimal moisture content, water between fibers was lost and direct contact between fibers was achieved, maximizing the electrical conductivity of the composite. After this point, when the smart concrete was heated for a longer time, the electrical resistance increased almost 300% because water acting as electrolyte was lost. Thus, smart concrete is sensitive to moisture change and can be used as moisture sensor, especially at constructions exposed to harmful water. The effect of moisture content on the strain sensitivity of smart concrete was tested. The mechanism relating piezoresistive properties and moisture content were enlightened. Multifunctional smart concrete can be used as strain, Fire and moisture sensor while acting as a load bearing element.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and Environmen