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8th International Conference on Applications and Techniques in Information Security, ATIS 2017

作者： Sharmila Deva Selvi, S. Paul, Arinjita Pandu Rangan, C. Theoretical Computer Science Lab Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)9789811054204

Proxy re-encryption (PRE) allows re-encryption of a ciphertext for Alice (delegator) into a ciphertext for Bob (delegatee) via a semi-trusted proxy, who should not obtain the underlying plaintext. Alice generates a re-encryption key (re-key) for the proxy using which, the proxy transforms the ciphertexts. The basic notion of PRE provides security against the proxy from learning anything about the encrypted message given the re-encryption key. However, this is not sufficient in all situations as the proxy can collude with Bob and re-delegate Alice’s decryption rights. Hence, non-transferability is a desirable property in real-time scenarios wherein an illegal attempt to transfer Alice’s decryption rights exposes Bob’s private key as a penalty. In Pairing 2010, Wang et al. presented a CPA secure non-transferable Identity Based PRE scheme in the random oracle model. However, we show that the scheme violates the non-transferable property. Also, we present the first construction of a non-transferable unidirectional PRE scheme in the PKI setting using bilinear maps which meets CCA security under a variant of the decisional Diffie-Hellman hardness assumption in the random oracle model. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Security of data

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CUSUM Based Concept Drift Detector for Data Stream Clustering 20

CUSUM Based Concept Drift Detector for Data Stream Clusterin...

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4th International Conference on Big Data and Internet of Things, BDIOT 2020

作者： Namitha, K. Santhosh Kumar, G. Artificial Intelligence and Computer Vision Lab Department of Computer Science Cochin University of Science and Technology Kochi India

ISBN: (纸本)9781450375504

The last few decades mark an unprecedented growth in the number of applications producing high-speed data streams. Learning from such fast data streams has many inherent challenges. The dynamic change in the concept of the stream is a significant challenge to be handled by the learning systems. This problem termed concept drift is given due focus in data stream classification scenarios. But, data stream clustering algorithms usually treat concept drift implicitly as part of the learning process. The need for explicit drift detection and adaptation is often neglected. This paper discusses a statistical method of change detection for data stream clustering problems. The change detection is done based on CUSUM test. On identifying a change, the model is re-built using the recent samples from the stream. The change detection process has been validated using real and synthetic datasets. © 2020 ACM.

关键词： Learning systems

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Identity based public verifiable signcryption scheme

Identity based public verifiable signcryption scheme

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4th International Conference on Provable Security, ProvSec 2010

作者： Selvi, S. Sharmila Deva Sree Vivek, S. Pandu Rangan, C. Theoretical Computer Science Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India

ISBN: (纸本)3642162797

Signcryption as a cryptographic primitive that offers both confidentiality and authentication simultaneously. Generally, in signcryption schemes, the message is hidden and thus the validity of the signcryption can be verified only after the unsigncryption process. Thus, a third party will not be able to verify whether the signcryption is valid or not. Signcryption schemes that allow any one to verify the validity of signcryption without the knowledge of the message are called public verifiable signcryption schemes. Third party verifiable signcryption schemes allow the receiver of a signcryption, to convince a third party that the signcryption is valid, by providing some additional information along with the signcryption. This information can be anything other than the receiver's private key and the verification may or may not require the exposure of the corresponding message. This paper shows the security weaknesses in two such existing schemes namely [14] and [4]. The scheme in [14] is Public Key Infrastructure (PKI) based scheme and the scheme in [4] is an identity based scheme. More specifically, [14] is based on elliptic curve digital signature algorithm (ECDSA). We also, provide a new identity based signcryption scheme that provides both public verifiability and third party verification. We formally prove the security of the newly proposed scheme in the random oracle model. © 2010 Springer-Verlag.

关键词： Authentication

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Compact stateful encryption schemes with ciphertext verifiability

Compact stateful encryption schemes with ciphertext verifiab...

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7th International Workshop on Security, IWSEC 2012

作者： Vivek, S. Sree Selvi, S. Sharmila Deva Rangan, C. Pandu Theoretical Computer Science Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India

ISBN: (纸本)9783642341168

Increasingly wider deployment of encryption schemes call for schemes possessing additional properties such as randomness re-use, compactness and ciphertext verifiability. While novel approaches such as stateful encryption schemes contributes for randomness re-use (to save computational efforts), the requirements such as ciphertext verifiability leads to increase in the size of ciphertext. Thus, it is interesting and challenging to design stateful encryption schemes that offer ciphertext verifiability and result in compact ciphertexts. We propose two new stateful public key encryption schemes with ciphertext verifiability. Our schemes offer more compact ciphertexts when compared to all existing stateful public key encryption schemes with ciphertext verifiability. Our first scheme is based on the SDH assumption and the second scheme is based on the CDH assumption. We have proved both the schemes in the random oracle model. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Security of data

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Breaking and fixing of an identity based multi-signcryption scheme

Breaking and fixing of an identity based multi-signcryption ...

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3rd International Conference on Provable Security, ProvSec 2009

作者： Sharmila Deva Selvi, S. Sree Vivek, S. Pandu Rangan, C. Theoretical Computer Science Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India

ISBN: (纸本)364204641X

Signcryption is a cryptographic primitive that provides authentication and confidentiality simultaneously in a single logical step. It is often required that multiple senders have to signcrypt a single message to a certain receiver. Obviously, it is inefficient to signcrypt the messages separately. An efficient alternative is to go for multi-signcryption. The concept of multi-signcryption is similar to that of multi-signatures with the added property - confidentiality. Recently, Jianhong et al. proposed an identity based multi-signcryption scheme. They claimed that their scheme is secure against adaptive chosen ciphertext attack and it is existentially unforgeable. In this paper, we show that their scheme is not secure against chosen plaintext attack and is existentially forgeable, we also provide a fix for the scheme and prove formally that the improved scheme is secure against both adaptive chosen ciphertext attack and existential forgery. © Springer-Verlag 2009.

关键词： Public key cryptography

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Macroscopic GA-based Multi-Objective Traffic Light Optimization prioritizing tramways

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Applied Soft Computing 2025年 178卷

作者： Bilotta, Stefano Fereidooni, Zahra Ipsaro Palesi, Luciano Alessandro Nesi, Paolo University of Florence Department of Mathematics and Computer Science "U. Dini" Firenze50134 Italy University of Florence Distributed Systems and Internet Technology DISIT Lab Firenze50139 Italy

Urban traffic congestion significantly impacts city efficiency, environmental quality, public safety, and overall quality of life. The primary objective of this research has been to develop traffic light optimization strategies to reduce congestion in areas where tramways or high-speed buses need priority. To this end, a novel approach is presented in this paper as a Genetic Algorithm-based Multi-Objective Traffic Light Optimization (MaMoTLO). It takes into account multiple factors such as minimizing stops, reducing travel and waiting times (private and public), and ensures the synchronizations. This approach is particularly useful in urban areas where multiple tramways intersect with regular traffic, creating potential bottlenecks for private flows. The main innovative aspects are the insertion of structural constraints on flow and queues are junctions, the insertion of penalty constraint for the tramways passage, the capability of working at macroscale of the solution, the validation against real conditions, and the comparison with a large set of solutions. The work presented compares the new optimization strategies with existing state-of-the-art methods, including those based on Non-Dominated Sorting Genetic Algorithm II (NSGA-II/III), Simulation of Urban MObility) (SUMO) Actuated solutions, and Webster's formula for traffic light timing. The proposed solutions have been tested using real traffic data from Florence, Italy, and simulated scenarios to measure their effectiveness in reducing congestion and improving traffic flow on Snap4City open platform. The findings indicate that selected MaMoTLO solutions substantially outperform state-of-the-art methods by providing more balanced and efficient traffic light solutions (presenting improvement of 10 % or higher in real conditions), which is crucial for urban areas with high tramway traffic. The proposed optimization improves the flow of vehicular traffic and ensures that public transportation systems like tramways

关键词： Genetic algorithms

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Improved AlGaN/GaN HEMTs Grown on Si Substrates Using Stacked AlGaN/AlN Interlayer by MOCVD

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Chinese Physics Letters 2011年第5期28卷 206-209页

作者： WANG Yong YU Nai-Sen LI Ming LAU Kei-May National Key Lab on High Power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022 Photonics Technology Center Department of Electronic and Computer EngineeringHong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

AlGaN/GaN high electron mobility transistors(HEMTs)are grown on 2-inch Si(111)substrates by *** stacked AlGaN/AlN interlayer with different AlGaN thickness and indium surfactant doped is designed and optimized to relieve the tensile stress during GaN epitaxial *** top 1.0μm GaN buffer layer grown on the optimized AlGaN/AlN interlayer shows a crack-free and shining *** XRD results show that GaN(002)FWHM is 480arcsec and GaN(102)FWHM is *** AGaN/GaN HEMTs with optimized and nonoptimized AlGaN/AlN interlayer are grown and processed for comparison and the dc and rf characteristics are *** the dc characteristics of the device with optimized AlGaN/AlN interlayer,maximum drain current density I_(dss)of 737mA/mm,peak transconductance G_(m)of 185mS/mm,drain leakage current density Ids of 1.7μA/mm,gate leakage current density I_(gs)of 24.8μA/mm and off-state breakdown voltage VBR of 67V are achieved with L_(g)/W_(g)/L_(g)/L_(g)=1/10/1/1μ*** the small signal rf characteristics of the device with optimized AlGaN/AlN interlayer,current gain cutoff frequency fT of 8.3 GHz and power gain cutoff frequency fmax of 19.9GHz are achieved with L_(g)/W_(g)/L_(g)/L_(g)=1/100/1/1μ***,the best rf performance with fT of 14.5 GHz and fmax of 37.3 GHz is achieved with a reduced gate length of 0.7μm.

关键词： AlGaN/GaN Si(111) HEMTs MOCVD

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Astronomical Image Denoising by Self-Supervised Deep Learning and Restoration Processes

arXiv

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arXiv 2025年

作者： Liu, Tie Quan, Yuhui Su, Yingna Guo, Yang Liu, Shu Ji, Haisheng Hao, Qi Gao, Yulong Liu, Yuxia Wang, Yikang Sun, Wenqing Ding, Mingde School of Astronomy and Space Science Nanjing University 163 Xianlin Avenue Jiangsu Nanjing210023 China Ministry of Education 163 Xianlin Avenue Jiangsu Nanjing210023 China School of Computer Science and Engineering South China University of Technology 382 Waihuan East Road Guangdong Guangzhou510006 China Pazhou Lab 248 Qiaotou Street Guangdong Guangzhou510335 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences 10 Yuanhua Road Jiangsu Nanjing210034 China School of Astronomy and Space Science University of Science and Technology of China 96 Jinsai Road Anhui Hefei230026 China Department of Rheumatology Nanjing Drum Tower Hospital The Affiliated Hospital Of Nanjing University 321 Zhongshan Road Jiangsu Nanjing210008 China College of Engineering Peking University 5 Yiheyuan Road Beijing100871 China State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission China Energy Science and Technology Research Institute Co. Ltd 10 Xianjing Road Nanjing210034 China Faculty of Electrical Engineering and Computer Science Ningbo University No. 818 Fenghua Road Zhejiang Ningbo315211 China

Image denoising based on deep learning has witnessed significant advancements in recent years. However, existing deep learning methods lack quantitative control of the deviation or error on denoised images. The neural networks Self2Self is designed for denoising single-image, training on it and denoising itself, during which training is costly. In this work we explore training Self2Self on an astronomical image and denoising other images of the same kind, which is suitable for quickly denoising massive images in astronomy. To address the deviation issue, the abnormal pixels whose deviation exceeds a predefined threshold are restored to their initial values. The noise reduction includes training, denoising, restoring and named TDR-method, by which the noise level of the solar magnetograms is improved from about 8 G to 2 G. Furthermore, the TDR-method is applied to galaxy images from the Hubble Space Telescope and makes weak galaxy structures become much clearer. This capability of enhancing weak signals makes the TDR-method applicable in various disciplines. © 2025, CC BY-NC-SA.

关键词： Image denoising

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Execution of UML state machines using modelica

Execution of UML state machines using modelica

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3rd International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools, EOOLT 2010 - In Conjunction with the MODELS 2010 Conference

作者： Schamai, Wladimir Pohlmann, Uwe Fritzson, Peter Paredis, Christiaan J.J. Helle, Philipp Strobel, Carsten EADS Innovation Works Germany Department of Computer Science University of Paderborn Germany PELAB - Programming Environment Lab Linköping University Sweden Georgia Institute of Technology Atlanta United States

ModelicaML is a UML profile for the creation of executable models. ModelicaML supports the Model-Based Systems Engineering (MBSE) paradigm and combines the power of the OMG UML standardized graphical notation for systems and software modeling, and the simulation power of Modelica. This addresses the increasing need for precise integrated modeling of products containing both software and hardware. This paper focuses on the implementation of executable UML state machines in ModelicaML and demonstrates that using Modelica as an action language enables the integrated modeling and simulation of continuous-time and reactive or event-based system dynamics. More specifically, this paper highlights issues that are identified in the UML specification and that are experienced with typical executable implementations of UML state machines. The issues identified are resolved and rationales for design decisions taken are discussed.

关键词： Continuous time systems

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Pricing bilateral electricity trade between smart grids and hybrid green datacenters

Pricing bilateral electricity trade between smart grids and ...

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ACM SIGMETRICS International Conference on Measurement and Modeling of computer Systems, SIGMETRICS 2015

作者： Zhou, Zhi Liu, Fangming Li, Zongpeng Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology China Department of Computer Science University of Calgary Canada

ISBN: (纸本)9781450334860

Datacenter demand response is envisioned as a promising approach for mitigating operational instability faced by smart grids. It enables significant potentials in peak load shedding and facilitates the incorporation of distributed generation and intermittent energy sources. This work considers two key aspects towards realtime electricity pricing for eliciting demand response: (i) Two-way electricity flow between smart grids and large datacenters with hybrid green generation capabilities. (ii) The geo-distributed nature of large cloud systems, and hence the potential competition among smart grids that serve different datacenters of the cloud. We propose a pricing scheme tailored for geo-distributed green datacenters, from a multi-leader single-follower game point of view. At the cloud side, in quest for performance, scalability and robustness, the energy cost is minimized in a distributed manner, based on the technique of alternating direction of multipliers (ADMM). At the smart grid side, a practical equilibrium of the pricing game is desired. To this end, we employ mathematical programming with equilibrium constraints (MPEC), equilibrium problem with equilibrium constraints (EPEC) and exact linearization, to transform the multi-leader single-follower pricing game into a mixed integer linear program (MILP) that can be readily solved. The effectiveness of the proposed solutions is evaluated based on trace-driven simulations. © Copyright 2015 ACM.

关键词： Distributed cloud

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