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Detection Technique of Software-Induced Rowhammer Attacks

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Computers, Materials & Continua 2021年第4期67卷 349-367页

作者： Minkyung Lee jin kwak ISAA Lab. Department of Computer EngineeringAjou UniversitySuwon16499Korea Department of Cyber Security Ajou UniversitySuwon16499Korea

Side-channel attacks have recently progressed into software-induced *** particular,a rowhammer attack,which exploits the characteristics of dynamic random access memory(DRAM),can quickly and continuously access the cells as the cell density of DRAM increases,thereby generating a disturbance error affecting the neighboring cells,resulting in bit *** a rowhammer attack is a highly sophisticated attack in which disturbance errors are deliberately generated into data bits,it has been reported that it can be exploited on various platforms such as mobile devices,web browsers,and virtual ***,there have been studies on bypassing the defense measures of DRAM manufacturers and the like to respond to rowhammer attacks.A rowhammer attack can control user access and compromise the integrity of sensitive data with attacks such as a privilege escalation and an alteration of the encryption *** an attempt to mitigate a rowhammer attack,various hardware-and software-based mitigation techniques are being studied,but there are limitations in that the research methods do not detect the rowhammer attack in advance,causing overhead or degradation of the system ***,in this study,a rowhammer attack detection technique is proposed by extracting common features of rowhammer attack files through a static analysis of rowhammer attack codes.

关键词： Rowhammer attack static analysis detecting technique side-channel attack bit flip

Machine Learning-Based Advertisement Banner Identification Technique for Effective Piracy Website Detection Process

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Computers, Materials & Continua 2022年第5期71卷 2883-2899页

作者： Lelisa Adeba Jilcha jin kwak ISAA Lab. Department of AI Convergence NetworkAjou UniversitySuwon16499Korea Department of Cyber Security Ajou UniversitySuwon16499Korea

In the contemporary world, digital content that is subject to copyright is facing significant challenges against the act of copyright *** of dollars are lost annually because of this illegal act. The currentmost effective trend to tackle this problem is believed to be blocking thosewebsites, particularly through affiliated government bodies. To do so, aneffective detection mechanism is a necessary first step. Some researchers haveused various approaches to analyze the possible common features of suspectedpiracy websites. For instance, most of these websites serve online advertisement, which is considered as their main source of revenue. In addition, theseadvertisements have some common attributes that make them unique ascompared to advertisements posted on normal or legitimate websites. Theyusually encompass keywords such as click-words (words that redirect to installmalicious software) and frequently used words in illegal gambling, illegal sexual acts, and so on. This makes them ideal to be used as one of the key featuresin the process of successfully detecting websites involved in the act of copyrightinfringement. Research has been conducted to identify advertisements servedon suspected piracy websites. However, these studies use a static approachthat relies mainly on manual scanning for the aforementioned keywords. Thisbrings with it some limitations, particularly in coping with the dynamic andever-changing behavior of advertisements posted on these websites. Therefore,we propose a technique that can continuously fine-tune itself and is intelligentenough to effectively identify advertisement (Ad) banners extracted fromsuspected piracy websites. We have done this by leveraging the power ofmachine learning algorithms, particularly the support vector machine with theword2vec word-embedding model. After applying the proposed technique to1015 Ad banners collected from 98 suspected piracy websites and 90 normal orlegitimate websites, we were able to s

关键词： Copyright infringement piracy website detection online advertisement advertisement banners machine learning support vector machine word embedding word2vec

Some results on covers of complete graphs

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Chinese Science Bulletin 2000年第9期45卷 796-798页

作者： kwak jin Ho Mathematics Pohang University of Science and TechnologyPohang 790-784Korea

In the present note, (n, r, c)-covers with n = (2r -1 )c and bipartite double covers of complete graphs are classified.

关键词： cover distance-regular graph intersection array antipodal.

Circulant Double Coverings of a Circulant Graph of Valency Five

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Acta Mathematica Sinica,English Series 2007年第1期23卷 23-28页

作者： Rong Quan FENG jin Ho kwak LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China Mathematics Pohang University of Science and Technology Pohang 790-784 Korea

Enumerating the isomorphism classes of several types of graph covering projections is one of the central research topics in enumerative topological graph theory. A covering of G is called circulant if its covering graph is circulant. Recently, the authors [Discrete Math., 277, 73-85 （2004）1 enumerated the isomorphism classes of circulant double coverings of a certain type, called a typical covering, and showed that no double covering of a circulant graph of valency three is circulant. Also, in [Graphs and Combinatorics, 21,386 400 （2005）], the isomorphism classes of circulant double coverings of a circulant graph of valency four are enumerated. In this paper, the isomorphism classes of circulant double coverings of a circulant graph of valency five are enumerated.

关键词： graph covering voltage assignment Cayley circulant graph

Secure e-Prescription Management System:Mitigating Blended Threat in IoBE

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Computer Systems Science & Engineering 2023年第3期44卷 2501-2519页

作者： Deukhun Kim Heejin Kim jin kwak ISAA Lab. Institute for Information and CommunicationAjou UniversitySuwon16499Korea Korea Orphan&Essential Drug Center(KOEDC) Seoul04523Korea Department of Cyber Security Ajou UniversitySuwon16499Korea

New information and communication technologies(ICT)are being applied in various industries to upgrade the value of the major service ***,data collection,storage,processing,and security applications have led to the creation of an interrelated ICT environment in which one industry can directly influence the *** is called the“internet of blended environ-ments”(IoBE),as it is an interrelated data environment based on internet-of-things collection *** this environment,security incidents may increase as size and interconnectivity of attackable operations ***,pre-emptive responses to combined security threats are needed to securely utilize IoBE across *** example,the medical industry has more stringent information protection measures than other ***,it has become a major target of attackers,as more clinician–patient interactions occur over the internet owing to ***,this study aims to acquire security for IoBE while focusing on the medical *** the various types of medical ICT services,this study analyzes dataflow and potential security threats from the e-prescription lifecycle perspective,which is highly utilized,strongly data-centric,and has numerous security *** on our analysis,we propose a secure authentication and data-sharing scheme.

关键词： Authentication scheme blended threat e-prescription internet of blended environments

Secure Sharing Scheme of Sensitive Data in the Precision Medicine System

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Computers, Materials & Continua 2020年第9期64卷 1527-1553页

作者： Deukhun Kim Heejin Kim jin kwak ISAA Lab. Department of Computer EngineeringAjou UniversitySuwon16499Korea Korea Orphan&Essential Drug Center Seoul04523Korea Department of Cyber Security Ajou UniversitySuwon16499Korea

Numerous industries,especially the medical industry,are likely to exhibit significant developments in the *** since the announcement of the precision medicine initiative by the United States in 2015,interest in the field has considerably *** techniques of precision medicine are employed to provide optimal treatment and medical services to patients,in addition to the prevention and management of diseases via the collection and analysis of big data related to their individual genetic characteristics,occupation,living environment,and dietary *** this involves the accumulation and utilization of sensitive information,such as patient history,DNA,and personal details,its implementation is difficult if the data are inaccurate,exposed,or forged,and there is also a concern for privacy,as massive amount of data are collected;hence,ensuring the security of information is ***,it is necessary to develop methods of securely sharing sensitive data for the establishment of a precision medicine *** authentication and data sharing scheme is presented in this study on the basis of an analysis of sensitive *** proposed scheme securely shares sensitive data of each entity in the precision medicine system according to its architecture and data flow.

关键词： Precision medicine sensitive data keyless signature infrastructure data sharing

Novel Architecture of Security Orchestration, Automation and Response in Internet of Blended Environment

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Computers, Materials & Continua 2022年第10期73卷 199-223页

作者： Minkyung Lee Julian Jang-Jaccard jin kwak ISAA Lab Department of Cyber SecurityAjou UniversitySuwon16499Korea Department of Computer Science and Information Technology Massey UniversityAuckland0745New Zealand Department of Cyber Security Ajou UniversitySuwon16499Korea

New technologies that take advantage of the emergence of massive Internet of Things(IoT)and a hyper-connected network environment have rapidly increased in recent *** technologies are used in diverse environments,such as smart factories,digital healthcare,and smart grids,with increased security *** intend to operate Security Orchestration,Automation and Response(SOAR)in various environments through new concept definitions as the need to detect and respond automatically to rapidly increasing security incidents without the intervention of security personnel has *** facilitate the understanding of the security concern involved in this newly emerging area,we offer the definition of Internet of Blended Environment(IoBE)where various convergence environments are interconnected and the data analyzed in *** define Blended Threat(BT)as a security threat that exploits security vulnerabilities through various attack surfaces in the *** propose a novel SOAR-CUBE architecture to respond to security incidents with minimal human intervention by automating the BT response *** Security Orchestration,Automation,and Response(SOAR)part of our architecture is used to link heterogeneous security technologies and the threat intelligence function that collects threat data and performs a correlation analysis of the *** is operated under Collaborative Units of Blended Environment(CUBE)which facilitates dynamic exchanges of data according to the environment applied to the IoBE by distributing and deploying security technologies for each BT type and dynamically combining them according to the cyber kill chain stage to minimize the damage and respond efficiently to BT.

关键词： Blended threat(BT) collaborative units for blended environment(CUBE) internet of blended environment(IoBE) security orchestration,automation and response(SOAR)

Expression of a High Mobility Group Protein Isolated from Cucumis sativus Affects the Germination of Arabidopsis thaliana under Abiotic Stress Conditions

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Journal of Integrative Plant Biology 2008年第5期50卷 593-600页

作者： Ji Young Jang Kyung jin kwak Hunseung Kang Department of Plant Biotechnology Agricultural Plant Stress Research Center and Biotechnology Research InstituteCollege of Agriculture and Life SciencesChonnam National UniversityGwangju 500-757Korea

Although high mobility group B （HMGB） proteins have been identified from a variety of plant species, their importance and functional roles in plant responses to changing environmental conditions are largely unknown. Here, we investigated the functional roles of a CsHMGB isolated from cucumber （Cucumis sativus L.） in plant responses to environmental stimuli. Under normal growth conditions or when subjected to cold stress, no differences in plant growth were found between the wild-type and transgenic Arabidopsis thaliana overexpressing CsHMGB. By contrast, the transgenic Arabidopsis plants displayed retarded germination compared with the wild-type plants when grown under high salt or dehydration stress conditions. Germination of the transgenic plants was delayed by the addition of abscisic acid （ABA）, implying that CsHMGB affects germination through an ABA-dependent way. The expression of CsHMGB had affected only the germination stage, and CsHMGB did not affect the seedling growth of the transgenic plants under the stress conditions. The transcript levels of several germination-responsive genes were modulated by the expression of CsHMGB in Arabidopsis. Taken together, these results suggest that ectopic expression of a CsHMGB in Arabidopsis modulates the expression of several germinationresponsive genes, and thereby affects the germination of Arabidopsis plants under different stress conditions.

关键词： abiotic stress cucumber Cucumis sativus high mobility group protein transgenic Arabidopsis plant.

Enumerating reflexible 2-cell embeddings of connected graphs

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Science China Mathematics 2013年第5期56卷 933-950页

作者： FENG YanQuan kwak jin Ho ZHOU jinXin Department of Mathematics Beijing Jiaotong University Department of Mathematics Pohang University of Science and Technology

Abstract Two 2-cell embeddings l ： X → S and 3 ： X → S of a connected graph X into a closed orientable surface S are congruent if there are an orientation-preserving surface homeomorphism h on S and a graph automorphism γ of X such that γh = γj. A 2-cell embedding l ： X → S of a graph X into a closed orientable surface S is described combinatorially by a pair （X; p） called a map, where p is a product of disjoint cycle permutations each of which is the permutation of the darts of X initiated at the same vertex following the orientation of S. The mirror image of a map （X; p） is the map （X; p- 1）, and one of the corresponding embeddings is called the mirror image of the other. A 2-cell embedding of X is reflexible if it is congruent to its mirror image. Mull et al. [Proc Amer Math Soc, 1988, 103： 321-330] developed an approach for enumerating the congruence classes of 2-cell embeddings of graphs into closed orientable surfaces. In this paper we introduce a method for enumerating the congruence classes of reflexible 2-cell embeddings of graphs into closed orientable surfaces, and apply it to the complete graphs, the bouquets of circles, the dipoles and the wheel graphs to count their congruence classes of reflexible or nonreflexible （called chiral） embeddings.

关键词： graphs surface 2-cell embedding rotation reflexible