• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.131-134
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• 2011

Several Web Service security standards are widely utilized aiming at securing exchanges of SOAP messages among partners in a collaborative environment. Although such standards are suitable for ensuring end-to-end message level security, certain attacks such as XML rewriting may still occur and lead to significant security vulnerabilities. This paper explores the security vulnerabilities of SOAP messages and proposes an ontology-based approach that can successfully combat the security threats. We develop ontology-based schema to include SOAP structure information in outgoing SOAP message and validate this information in the receiving end. Thus, allow to detect XML rewriting attacks early in the validating process.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.10
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• pp.1525-1530
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• 2022

BGP(Border Gateway Protocol) is a routing protocol that is actively used in inter-AS routing on the Internet. However, BGP routing protocol is vulnerable to BGP hijacking attacks that hijack the network by impersonating normal BGP sessions. BGP Hijacking attacks can lead to causing intercept IP traffic or interference with the normal service operation. Recently, BGP hijacking attacks, which have often occurred overseas, have also occurred in Korea. It means threatening the security of the Internet. In this paper, we analyze the overall process of attack through representative attack cases and virtual scenarios of BGP hijacking and based on the results of analyzing the application status of security technology to prevent BGP hijacking attacks by Korea and global major ISPs. It covers the technical proposal of ISPs and autonomous system operators should take to defend against BGP hijacking attacks.

• Convergence Security Journal
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• v.6 no.4
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• pp.11-19
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• 2006

Web service is giving an equal privilege to all user for sharing their resources. Under this situation, a lot of vulnerability against the various attacks through the Internet is possible, more sophisticated security services are necessary. In this paper, we propose an access control scheme using SPKI (Simple Public Infrastructure). The scheme designates an access control by providing the certificate to users who request a connection for resource sharing and limits the resource usage of information provider according to the access right that is given to their own rights.

• International Journal of Computer Science & Network Security
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• v.22 no.6
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• pp.390-399
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• 2022

Cyber security and resilience are phrases that describe safeguards of ICTs (information and communication technologies) from cyber-attacks or mitigations of cyber event impacts. The sole purpose of Risk models are detections, analyses, and handling by considering all relevant perceptions of risks. The current research effort has resulted in the development of a new paradigm for safeguarding services offered online which can be utilized by both service providers and users. customers. However, rather of relying on detailed studies, this approach emphasizes task selection and execution that leads to successful risk treatment outcomes. Modelling intelligent CSGs (Cyber Security Games) using MLTs (machine learning techniques) was the focus of this research. By limiting mission risk, CSGs maximize ability of systems to operate unhindered in cyber environments. The suggested framework's main components are the Threat and Risk models. These models are tailored to meet the special characteristics of online services as well as the cyberspace environment. A risk management procedure is included in the framework. Risk scores are computed by combining probabilities of successful attacks with findings of impact models that predict cyber catastrophe consequences. To assess successful attacks, models emulating defense against threats can be used in topologies. CSGs consider widespread interconnectivity of cyber systems which forces defending all multi-step attack paths. In contrast, attackers just need one of the paths to succeed. CSGs are game-theoretic methods for identifying defense measures and reducing risks for systems and probe for maximum cyber risks using game formulations (MiniMax). To detect the impacts, the attacker player creates an attack tree for each state of the game using a modified Extreme Gradient Boosting Decision Tree (that sees numerous compromises ahead). Based on the findings, the proposed model has a high level of security for the web sources used in the experiment.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.4
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• pp.885-895
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• 2017

Security issues arise due to various types of external intrusions as much as the rapidly changing IT environment. Attacks using vulnerabilities in web applications are increasing, and companies are trying to find the cause of the vulnerability, prevent external intrusion, and protect their systems and important information. Especially, according to the Supervision Regulation, each financial institution and electronic financial service provider shall perform vulnerability analysis evaluation for the website for disclosure once every six months and report the result to the Financial Services Commission. In this study, based on the Web vulnerability items defined in the Supervision Regulation, based on the inspection cases of actual financial institution, we analyze the most frequently occurring items and propose effective countermeasures against them and ways to prevent them from occurring in advance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.4
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• pp.2149-2170
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• 2017

Application-layer Distributed Denial-of-Service (DDoS) attack is one of the leading security problems in the Internet. In recent years, the attack strategies of application-layer DDoS have rapidly developed. This paper introduces a new attack strategy named Path Vulnerabilities-Based (PVB) attack. In this attack strategy, an attacker first analyzes the contents of web pages and subsequently measures the actual response time of each webpage to build a web-resource-weighted-directed graph. The attacker uses a Top M Longest Path algorithm to find M DDoS vulnerable paths that consume considerable resources when sequentially accessing the pages following any of those paths. A detection mechanism for such attack is also proposed and discussed. A finite-state machine is used to model the dynamical processes for the state of the user's session and monitor the PVB attacks. Numerical results based on real-traffic simulations reveal the efficiency of the attack strategy and the detection mechanism.

• The Journal of Society for e-Business Studies
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• v.17 no.3
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• pp.117-128
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• 2012

There was a large scale of DDoS(Distributed Denial of Service) attacks mostly targeted at Korean government web sites and cooperations's on March 4, 2010(3.4 DDoS attack) after 7.7 DDoS on July 7, 2009. In these days, anyone can create zombie PCs to attack someone's website with malware development toolkits and farther more improve their knowledge of hacking skills as well as toolkits because it has become easier to obtain these toolkits on line, For that trend, it has been difficult for computer security specialists to counteract DDoS attacks. In this paper, we will introduce an essential control list to prevent malware infection with live forensics techniques after analysis of monitoring network systems and PCs. Hopefully our suggestion of how to coordinate a security monitoring system in this paper will give a good guideline for cooperations who try to build their new systems or to secure their existing systems.

• The Journal of Society for e-Business Studies
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• v.10 no.2
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• pp.89-108
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• 2005

The SOAP specifications are not provided a functions of information security, especially authentication function. In case of user authentication, delivery of the username and password elements can be exposed to sniffing/replay attack by malicious attacker. In this paper, we propose a new mechanism to protect authentication attacks for the SOAP messages. The proposed mechanism is compensated for weakness of S/KEY system. Our mechanism has no limitation for time and overhead and also provide a more effective and secure delivery.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.12
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• pp.2171-2178
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• 2008

Recently, Network companies have introduced security solutions to protect the network from intrusions, attacks and viruses but the network has still weakness and vulnerability. It is time to bring more stable and reliable authentication system that would meet the Internet user's need. In this study, Current broadband networks don't have hierarchic and stable authentication solutions. And so, an integrated and hierarchic system is needed to provide a various kinds of application services. I'd like to present a new authentication system which is based on unified web authentication design. It will unit various authentication systems that have been deployed in various network environment and reinforce network security to provice a various kinds of application services in a stable and safe environment. that is a simple and more secure method for fighting a rise in card-not-present fraud.

• Journal of KIISE
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• v.44 no.1
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• pp.1-12
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• 2017

The continuously growing internet service requirements has resulted in a multitier system structure consisting of web server and database (DB) server. In this multitier structure, the existing intrusion detection system (IDS) detects known attacks by matching misused traffic patterns or signatures. However, malicious change to the contents at DB server through hypertext transfer protocol (HTTP) requests at the DB server cannot be detected by the IDS at the DB server's end, since the DB server processes structured query language (SQL) without knowing the associated HTTP, while the web server cannot identify the response associated with the attacker's SQL query. To detect these types of attacks, the malicious user is tracked using knowledge on interaction between HTTP request and SQL query. However, this is a practical challenge because system's source code analysis and its application logic needs to be understood completely. In this study, we proposed a scheme to find the HTTP request associated with a given SQL query using only system log files. We first generated an HTTP request-SQL query map from system log files alone. Subsequently, the HTTP request associated with a given SQL query was identified among a set of HTTP requests using this map. Computer simulations indicated that the proposed scheme finds the HTTP request associated with a given SQL query with 94% accuracy.