The Experts below are selected from a list of 15567 Experts worldwide ranked by ideXlab platform
Thomas Schneider - One of the best experts on this subject based on the ideXlab platform.
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Garbled circuits for Leakage-resilience: hardware implementation and evaluation of one-time programs
Cryptographic Hardware and Embedded Systems CHES 2010, 2010Co-Authors: Kimmo Järvinen, Vladimir Kolesnikov, Ahmad-reza Sadeghi, Thomas SchneiderAbstract:The power of side-channel Leakage attacks on cryptographic implementations is evident. Today's practical defenses are typically attack-specific countermeasures against certain classes of side-channel attacks. The demand for a more general solution has given rise to the recent theoretical research that aims to build provably Leakage-resilient cryptography. This direction is, however, very new and still largely lacks practitioners' evaluation with regard to both efficiency and practical security. A recent approach, One-Time Programs (OTPs), proposes using Yao's Garbled Circuit (GC) and very simple tamper-proof hardware to securely implement oblivious transfer, to guarantee Leakage resilience. Our main contributions are (i) a generic architecture for using GC/ OTP modularly, and (ii) hardware implementation and efficiency analysis of GC/OTP evaluation. We implemented two FPGA-based prototypes: a system-on-a-programmable-chip with access to hardware crypto accelerator (suitable for smartcards and future smartphones), and a stand-alone hardware implementation (suitable for ASIC design). We chose AES as a representative complex function for implementation and measurements. As a result of this work, we are able to understand, evaluate and improve the practicality of employing GC/OTP as a Leakage-Resistance approach.
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garbled circuits for Leakage resilience hardware implementation and evaluation of one time programs
IACR Cryptology ePrint Archive, 2010Co-Authors: Kimmo Järvinen, Vladimir Kolesnikov, Ahmad-reza Sadeghi, Thomas SchneiderAbstract:The power of side-channel Leakage attacks on cryptographic implementations is evident. Today’s practical defenses are typically attack-specific countermeasures against certain classes of side-channel attacks. The demand for a more general solution has given rise to the recent theoretical research that aims to build provably Leakage-resilient cryptography. This direction is, however, very new and still largely lacks practitioners’ evaluation with regard to both efficiency and practical security. A recent approach, One-Time Programs (OTPs), proposes using Yao’s Garbled Circuit (GC) and very simple tamper-proof hardware to securely implement oblivious transfer, to guarantee Leakage resilience. Our main contributions are (i) a generic architecture for using GC/OTP modularly, and (ii) hardware implementation and efficiency analysis of GC/OTP evaluation. We implemented two FPGA-based prototypes: a system-on-a-programmable-chip with access to hardware crypto accelerator (suitable for smartcards and future smartphones), and a stand-alone hardware implementation (suitable for ASIC design). We chose AES as a representative complex function for implementation and measurements. As a result of this work, we are able to understand, evaluate and improve the practicality of employing GC/OTP as a Leakage-Resistance approach. Last, but not least, we believe that our work contributes to bringing together the results of both theoretical and practical communities.
Hyeoncheol Kim - One of the best experts on this subject based on the ideXlab platform.
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comparison of bacterial Leakage Resistance of various root canal filling materials and methods confocal laser scanning microscope study
Scanning, 2015Co-Authors: Ji Hee Hwang, Jin Chung, Eunjoo Park, Sang Won Kwak, Hyeoncheol KimAbstract:Summary This study evaluated the bacterial Leakage Resistance and root canal lining efficacy of various root canal filling materials and methods by using confocal laser-scanning microscope (CLSM). Sixty extracted human premolars with mature apex and single root canal were randomly divided into 2 control groups and 4 experimental groups. Group CW was filled with continuous wave technique using gutta-percha and AH Plus sealer. Group GC was coated with AH-Plus sealer and then obturated with soften GuttaCore. Group GF was obturated using GuttaFlow and gutta-percha. Group EM was filled with EndoSeal MTA and gutta-percha using ultrasonic vibration. The AH-Plus, GuttaFlow, and EndoSeal were labeled with Hoechst 33342 to facilitate fluorescence. The obturated root tip was incubated with Carboxyfluorescein diacetate succinimidyl ester (CFSE)-stained E. faecalis for 14 days. CLSM was performed to evaluate the sealer distribution and bacterial Leakage for the apical 1-, 2-, 3-mm specimens. Statistically significant differences were determined by 1-way ANOVA with Tukey's post-hoc test and Pearson's correlation analysis. Group EM showed the better sealer distribution score than the other groups (p 0.05). Under the conditions of this study, different root canal filling materials and methods showed different efficacy for canal distribution and bacterial Leakage Resistance. SCANNING 37:422–428, 2015. © 2015 Wiley Periodicals, Inc.
Sumin Kim - One of the best experts on this subject based on the ideXlab platform.
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three dimensional hybrid carbon nanocomposite based intelligent composite phase change material with Leakage Resistance low electrical resistivity and high latent heat
Journal of Industrial and Engineering Chemistry, 2021Co-Authors: Dimberu G Atinafu, Beom Yeol Yun, Yujin Kang, Sumin KimAbstract:Abstract The development of shape-stabilized composite phase change materials (PCMs) is critical for realization of efficient thermal energy management systems and sustainable energy utilization. Herein, we designed an intelligent, multifunctional, organic composite PCMs with a three-dimensional (3D) hybrid nanocomposite and n-pentadecane. The 3D hybrid material was designed via integration of exfoliated graphene nanoplatelets (xGnP) and multiwalled carbon nanotubes (CNTs). The hybrid nanocomposite exploited the distinctive attributes and synergistic effect of each the supporting component for the well-designed composite PCMs to demonstrate high physical and thermochemical responses. The obtained composite PCM presented a high loading ratio of 82.7% and latent heat of 150.9 ± 0.9 J/g (which is 36% higher than that of the pristine xGnP-supported PCMs) owing to favorable space availability for phase change transformation with the aid of the CNTs skeleton. Moreover, the composite exhibited reduced supercooling (56.6% lower than that of CNTs-supported n-alkane), high Leakage Resistance capability, and thermal stability performance. The composite PCMs can also enable realization of a thermoelectric conversion system (lower than 101 Ω m resistivity, which is a reduction of more than six orders of magnitude compared with pristine n-alkane) and exhibit high thermal diffusivity (up to 3.707 mm2/s), indicating several practical applications thereof.
Kimmo Järvinen - One of the best experts on this subject based on the ideXlab platform.
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Garbled circuits for Leakage-resilience: hardware implementation and evaluation of one-time programs
Cryptographic Hardware and Embedded Systems CHES 2010, 2010Co-Authors: Kimmo Järvinen, Vladimir Kolesnikov, Ahmad-reza Sadeghi, Thomas SchneiderAbstract:The power of side-channel Leakage attacks on cryptographic implementations is evident. Today's practical defenses are typically attack-specific countermeasures against certain classes of side-channel attacks. The demand for a more general solution has given rise to the recent theoretical research that aims to build provably Leakage-resilient cryptography. This direction is, however, very new and still largely lacks practitioners' evaluation with regard to both efficiency and practical security. A recent approach, One-Time Programs (OTPs), proposes using Yao's Garbled Circuit (GC) and very simple tamper-proof hardware to securely implement oblivious transfer, to guarantee Leakage resilience. Our main contributions are (i) a generic architecture for using GC/ OTP modularly, and (ii) hardware implementation and efficiency analysis of GC/OTP evaluation. We implemented two FPGA-based prototypes: a system-on-a-programmable-chip with access to hardware crypto accelerator (suitable for smartcards and future smartphones), and a stand-alone hardware implementation (suitable for ASIC design). We chose AES as a representative complex function for implementation and measurements. As a result of this work, we are able to understand, evaluate and improve the practicality of employing GC/OTP as a Leakage-Resistance approach.
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garbled circuits for Leakage resilience hardware implementation and evaluation of one time programs
IACR Cryptology ePrint Archive, 2010Co-Authors: Kimmo Järvinen, Vladimir Kolesnikov, Ahmad-reza Sadeghi, Thomas SchneiderAbstract:The power of side-channel Leakage attacks on cryptographic implementations is evident. Today’s practical defenses are typically attack-specific countermeasures against certain classes of side-channel attacks. The demand for a more general solution has given rise to the recent theoretical research that aims to build provably Leakage-resilient cryptography. This direction is, however, very new and still largely lacks practitioners’ evaluation with regard to both efficiency and practical security. A recent approach, One-Time Programs (OTPs), proposes using Yao’s Garbled Circuit (GC) and very simple tamper-proof hardware to securely implement oblivious transfer, to guarantee Leakage resilience. Our main contributions are (i) a generic architecture for using GC/OTP modularly, and (ii) hardware implementation and efficiency analysis of GC/OTP evaluation. We implemented two FPGA-based prototypes: a system-on-a-programmable-chip with access to hardware crypto accelerator (suitable for smartcards and future smartphones), and a stand-alone hardware implementation (suitable for ASIC design). We chose AES as a representative complex function for implementation and measurements. As a result of this work, we are able to understand, evaluate and improve the practicality of employing GC/OTP as a Leakage-Resistance approach. Last, but not least, we believe that our work contributes to bringing together the results of both theoretical and practical communities.
Ji Hee Hwang - One of the best experts on this subject based on the ideXlab platform.
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comparison of bacterial Leakage Resistance of various root canal filling materials and methods confocal laser scanning microscope study
Scanning, 2015Co-Authors: Ji Hee Hwang, Jin Chung, Eunjoo Park, Sang Won Kwak, Hyeoncheol KimAbstract:Summary This study evaluated the bacterial Leakage Resistance and root canal lining efficacy of various root canal filling materials and methods by using confocal laser-scanning microscope (CLSM). Sixty extracted human premolars with mature apex and single root canal were randomly divided into 2 control groups and 4 experimental groups. Group CW was filled with continuous wave technique using gutta-percha and AH Plus sealer. Group GC was coated with AH-Plus sealer and then obturated with soften GuttaCore. Group GF was obturated using GuttaFlow and gutta-percha. Group EM was filled with EndoSeal MTA and gutta-percha using ultrasonic vibration. The AH-Plus, GuttaFlow, and EndoSeal were labeled with Hoechst 33342 to facilitate fluorescence. The obturated root tip was incubated with Carboxyfluorescein diacetate succinimidyl ester (CFSE)-stained E. faecalis for 14 days. CLSM was performed to evaluate the sealer distribution and bacterial Leakage for the apical 1-, 2-, 3-mm specimens. Statistically significant differences were determined by 1-way ANOVA with Tukey's post-hoc test and Pearson's correlation analysis. Group EM showed the better sealer distribution score than the other groups (p 0.05). Under the conditions of this study, different root canal filling materials and methods showed different efficacy for canal distribution and bacterial Leakage Resistance. SCANNING 37:422–428, 2015. © 2015 Wiley Periodicals, Inc.