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Extraction Security of Sequential Aggregate signatures

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Chinese Journal of Electronics 2021年第5期30卷 885-894页

作者： ZHAI Jiaqi LIU Jian CHEN Lusheng School of Mathematical Sciences Nankai University School of Cybersecurity College of Intelligence and ComputingTianjin University

Aggregate signature schemes enable anyone to compress many signatures into one.Besides the unforgeability of aggregate signature,another property called aggregate extraction sometimes is useful.In sequential aggregate signature schemes,the aggregate signature is computed incrementally by the signers.We introduce extraction security in the sequential context which can be seen as an analogy of aggregate extraction introduced by Boneh et al.in CRYPTO 2003.In addition to the practical meaning,it also has benefits in the construction of hierarchical identity-based signatures as we will point out.We study several well known aggregate signature schemes and prove some of them satisfy extraction security.

关键词： Cryptography Data security digital signatures Sequential aggregate signatures Hierarchical identity-based signatures Aggregate extraction

An improved Durandal signature scheme

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Science China(Information Sciences) 2020年第3期63卷 140-155页

作者： Yongcheng SONG Xinyi HUANG Yi MU Wei WU Fujian Provincial Key Laboratory of Network Security and Cryptology College of Mathematics and InformaticsFujian Normal University

Constructing secure and effective code-based signature schemes has been an open problem. In this paper, we efficiently reduce the key size of the Durandal signature scheme introduced by Aragon et al.(EUROCRYPT 2019). We prove that the improved scheme is EUF-CMA secure by reducing its security to the advanced product spaces subspaces indistinguishability(PSSI+) problem, the decisional rank syndrome decoding(DRSD) problem, and the affine rank syndrome decoding(ARSD) problem under the random oracle model. Furthermore, our signature scheme is more secure than the Durandal scheme because recovering key attacks are equivalent to solving the rank syndrome decoding(RSD) problem, instead of the rank support learning(RSL) problem in the original Durandal scheme. Our signature scheme takes less time to generate a signature owing to the fact that our signature scheme enjoys smaller security parameters in comparison to the Duradual scheme. We compare the new scheme with existing code-based signature schemes and find that our signature scheme has advantages in terms of the public key size.

关键词： post-quantum cryptography code-based cryptography rank metric digital signatures provable security

Verifiable image revision from chameleon hashes

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Cybersecurity 2021年第1期4卷 528-540页

作者： Junpeng Xu Haixia Chen Xu Yang Wei Wu Yongcheng Song College of Computer and Cyber Security Fujian Normal UniversityFuzhouChina

In a digital society,the rapid development of computer science and the Internet has greatly facilitated image applications.However,one of the public network also brings risks to both image tampering and privacy exposure.Image authentication is the most important approaches to verify image integrity and authenticity.However,it has been challenging for image authentication to address both issues of tampering detection and privacy protection.One aspect,image authentication requires image contents not be changed to detect tampering.The other,privacy protection needs to remove sensitive information from images,and as a result,the contents should be changed.In this paper,we propose a practical image authentication scheme constructed from chameleon hashes combined with ordinary digital signatures to make tradeoff between tampering detection and privacy protection.Our scheme allows legitimate users to modify contents of authenticated images with a privacy-aware purpose(for example,cover some sensitive areas with mosaics)according to specific rules and verify the authenticity without interaction with the original authenticator.The security of our scheme is guaranteed by the security of the underlying cryptographic primitives.Experiment results show that our scheme is efficient and practical.We believe that our work will facilitate image applications where both authentication and privacy protection are desirable.

关键词： Image authentication Privacy protection Cryptography Chameleon hashes digital signatures

Data Security Storage Model of the Internet of Things Based on Blockchain

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Computer Systems Science & Engineering 2021年第1期36卷 213-224页

作者： Pingshui Wang Willy Susilo School of Management Science and Engineering Anhui University of Finance and EconomicsBengbu233030China School of Computing and Information Technology University of WollongongWollongong2522Australia

With the development of information technology,the Internet of Things(IoT)has gradually become the third wave of the worldwide information industry revolution after the computer and the Internet.The application of the IoT has brought great convenience to people’s production and life.However,the potential information security problems in various IoT applications are gradually exposed and people pay more attention to them.The traditional centralized data storage and management model of the IoT is easy to cause transmission delay,single point of failure,privacy disclosure and other problems,and eventually leads to unpredictable behavior of the system.Blockchain technology can effectively improve the operation and data security status of the IoT.Referring to the storage model of the Fabric blockchain project,this paper designs a data security storage model suitable for the IoT system.The simulation results show that the model is not only effective and extensible,but also can better protect the data security of the Internet of Things.

关键词： Internet of Things(IoT) blockchain data security digital signatures encryption model

A Secured Message Transmission Protocol for Vehicular Ad Hoc Networks

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Computers, Materials & Continua 2021年第7期68卷 229-246页

作者： A.F.M.Suaib Akhter A.F.M.Shahen Shah Mohiuddin Ahmed Nour Moustafa UnalÇavu¸soglu Ahmet Zengin Department of Computer Engineering Sakarya UniversitySakarya54050Turkey Department of Electrical and Electronics Engineering Istanbul Gelisim UniversityIstanbulTurkey School of Science Edith Cowan UniversityPerthWA6027Australia School of Engineering and Information Technology UNSWCanberra BC2610Australia

Vehicular Ad hoc Networks(VANETs)become a very crucial addition in the Intelligent Transportation System(ITS).It is challenging for a VANET system to provide security services and parallelly maintain high throughput by utilizing limited resources.To overcome these challenges,we propose a blockchain-based Secured Cluster-based MAC(SCB-MAC)protocol.The nearby vehicles heading towards the same direction will form a cluster and each of the clusters has its blockchain to store and distribute the safety messages.The message which contains emergency information and requires Strict Delay Requirement(SDR)for transmission are called safety messages(SM).Cluster Members(CMs)sign SMs with their private keys while sending them to the blockchain to confirm authentication,integrity,and confidentiality of the message.A Certificate Authority(CA)is responsible for physical verification,key generation,and privacy preservation of the vehicles.We implemented a test scenario as proof of concept and tested the safety message transmission(SMT)protocol in a real-world platform.Computational and storage overhead analysis shows that the proposed protocol for SMT implements security,authentication,integrity,robustness,non-repudiation,etc.while maintaining the SDR.Messages that are less important compared to the SMs are called non-safety messages(NSM)and vehicles use RTS/CTS mechanism for NSM transmission.Numerical studies show that the proposed NSM transmission method maintains 6 times more throughput,2 times less delay and 125%less Packet Dropping Rate(PDR)than traditional MAC protocols.These results prove that the proposed protocol outperforms the traditional MAC protocols.

关键词： Ad hoc networks data security digital signatures distributed storage intelligent vehicles vehicular ad hoc networks wireless communication

Human-Centered A.I. and Security Primitives

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Journal of Computer Science Research 2020年第4期2卷 32-35页

作者： Alex Mathew Department of Cybersecurity Bethany CollegeUSA

The paper reviews how human-centered artificial intelligence and securityprimitive have influenced life in the modern world and how it’s useful inthe future. Human-centered A.I. has enhanced our capabilities by the wayof intelligence, human informed technology. It has created a technologythat has made machines and computer intelligently carry their function.The security primitive has enhanced the safety of the data and increasedaccessibility of data from anywhere regardless of the password is known.This has improved personalized customer activities and filled the gapbetween the human-machine. This has been successful due to the usageof heuristics which solve belowems by experimental, support vector machinewhich evaluates and group the data, natural language processingsystems which change speech to language. The results of this will lead toimage recognition, games, speech recognition, translation, and answeringquestions. In conclusion, human-centered A.I. and security primitivesis an advanced mode of technology that uses statistical mathematicalmodels that provides tools to perform certain work. The results keep onadvancing and spreading with years and it will be common in our lives.

关键词： Artificial Intelligence Deep learning digital signatures Machine learning Private information retrieval