• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.519-523
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• 2002

NIDS의 보급이 보편화됨에 따라 NUDS를 우회하기 위한 공격 기법 역시 많이 개발 되고 있다. 이런 공격들 중 일부는 NIDS 구조의 근본적인 결함을 이용하기 때문에 NIDS 구조에서는 해결될 수 없다. NIDS의 많은 장점들을 유지하면서도 NIDS의 한계를 극복하는 새로운 HIDS 모델을 제시한다. HIDS는 시스템에 많은 부하를 준다는 것이 가장 큰 문제점이지만, Web 서버는 특성상 모든 곳에서의 접속을 허용하므로 보안에 취약하기 때문에 어느 정도 HIDS에 의한 부하를 감수하더라도 보안을 강화해야만 한다. 또한. Web 서버는 Web 서비스라는 특정 목적만을 위해 운영되기 때문에 HIDS를 설치하더라도 Web 공격에 대해서만 고려함으로써 HIDS의 부하를 상당히 줄일 수 있다. 본 논문에서 제안하는 HIDS는 Linux 운영체제의 Kernel에서 TCP Stream을 추출하여 이를 감사 자료로써 사용하여 침입탐지를 한다.

• International Journal of Contents
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• v.11 no.4
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• pp.70-76
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• 2015

The development of technology provides and increases security as well as convenience for humans. The development of new technology directly affects the standard of life thanks to smart home automatic control systems. This paper describes a door control, automatic curtain, home security (CCTV, fire, gas, safe, etc.), home control (energy, light, ventilation, etc.) and web-based smart home automatic controller. It also describes the use of ARM (Advanced RISC Machines) for automatic control of home equipment, a Multi-Axes Servo Controller using FPGA (Field Programmable Gate Array) and PLC (programmable logic controller). Additionally, it describes the development of a HTML editor using web auto control software. The tab loading time (7 seconds) is faster when using ARM-based web browser software instead of Chrome and Firefox is used because the browser has a small memory footprint (300M). This system is realized by web auto controller language which controls and uses PLCs that are easier than existing devices. This smart home automatic control technology can control smart home equipment anywhere and anytime and provides a remote interface through mobile equipment.

• The Journal of Information Systems
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• v.10 no.1
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• pp.127-146
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• 2001

The area of business applications in the internet are extended enormously in result of fast development of computing and communication technologies, increase of internet use, and use of intranet/extranet in enterprise information system. Widely spread the use of the internet, there are various applications for Business to Business (B to B) or Business to Customer(B to C) model that are based on the intranet or extranet. This paper designed and implemented the Web-based Electronic Bidding System for Business to Business (B to B) model. The technical issues of electronic bidding system in the internet are involved in the connection between web client and server, electronic data interchange for the contract document, and security solution during the bidding and contracting processes. The web-based electronic bidding system in this paper is implemented using Java applet and servlet as a connection interface for web client and server, XML/EDI-based documents for a bid and a contract, and bidding server and notary server for enhancing the security using PKI(Public Key Infrastructure)-based public key cryptography, digital signature and Certification Authority(CA).

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.49-52
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• 2000

In this paper we have developed an image security system based on Internet Web in order to overcome the problem of existing systems that use the dedicated network. The developed system resolves the safety problem of the centralized control model by adapting the distributed control model based on Web, and has the functions of remote control and automatic monitoring for grouped multiple sites on Web browser. And the system can operate various computers or operating system because it's operating software was designed by the concepts of Java Virtual Machine and Virtual Instrument. Also, our system has not need of additional cost for network construction by using Internet and can greatly improve the managemental efficiency of system because the maintenance and publishing of software updates can be performed through Web Server.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.956-959
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• 2011

When SOAP message in Web Services has sensitive and important data, it is necessary to protect the message from XML rewriting attacks. These attacks create a foundation for typical faults in SOAP message and make it vulnerable to use in Web Service environment. Currently, Web Services middleware offers limited functions to detect these faults and possibly fix them. In this paper, we propose a Security Description Assistance which identifies and fixes typical faults in SOAP messages. Our system adapts simulation-based approach, which allows system to self-optimize its performance in different conditions and thus improve the reliability of Web Services.

• Journal of the Korea Society of Computer and Information
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• v.14 no.12
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• pp.157-167
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• 2009

Recently, the leakage of confidential information and personal information is taking place on the Internet more frequently than ever before. Most of such online security incidents are caused by attacks on vulnerabilities in web applications developed carelessly. It is impossible to detect an attack on a web application with existing firewalls and intrusion detection systems. Besides, the signature-based detection has a limited capability in detecting new threats. Therefore, many researches concerning the method to detect attacks on web applications are employing anomaly-based detection methods that use the web traffic analysis. Much research about anomaly-based detection through the normal web traffic analysis focus on three problems - the method to accurately analyze given web traffic, system performance needed for inspecting application payload of the packet required to detect attack on application layer and the maintenance and costs of lots of network security devices newly installed. The UTM(Unified Threat Management) system, a suggested solution for the problem, had a goal of resolving all of security problems at a time, but is not being widely used due to its low efficiency and high costs. Besides, the web filter that performs one of the functions of the UTM system, can not adequately detect a variety of recent sophisticated attacks on web applications. In order to resolve such problems, studies are being carried out on the web application firewall to introduce a new network security system. As such studies focus on speeding up packet processing by depending on high-priced hardware, the costs to deploy a web application firewall are rising. In addition, the current anomaly-based detection technologies that do not take into account the characteristics of the web application is causing lots of false positives and false negatives. In order to reduce false positives and false negatives, this study suggested a realtime anomaly detection method based on the analysis of the length of parameter value contained in the web client's request. In addition, it designed and suggested a WAF(Web Application Firewall) that can be applied to a low-priced system or legacy system to process application data without the help of an exclusive hardware. Furthermore, it suggested a method to resolve sluggish performance attributed to copying packets into application area for application data processing, Consequently, this study provide to deploy an effective web application firewall at a low cost at the moment when the deployment of an additional security system was considered burdened due to lots of network security systems currently used.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.10
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• pp.339-346
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• 2016

1 person media is becoming the leading trend among several media in the Internet era exploiting the individual desire of showing off. But, the vast accessibility of Internet produces the worry about privacy risk, which concludes in the increasement of closed SNS. In this paper, we propose a system based on PWW (Person Wide Web) where a person is producing a media and share it with other persons. PWW is an information system which consists of a smart-phone, mobile anchors, a standard web document, and his own cloud storage. An information consumer gets the link using his smart-phone from the mobile anchors attached on the objects in the field. The web browser in the smart-phone obtains the web documents designated by the link and presents it. We also explains the 1 person media system based on PWW and presents the example utilized in the field. We compared and analyzed the security factor of the system based on between WWW and PWW, and concluded that PWW is better than WWW in the aspect of security.

• ETRI Journal
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• v.42 no.3
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• pp.433-445
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• 2020

A denial-of-service (DoS) attack is a serious attack that targets web applications. According to Imperva, DoS attacks in the application layer comprise 60% of all the DoS attacks. Nowadays, attacks have grown into application- and business-layer attacks, and vulnerability-analysis tools are unable to detect business-layer vulnerabilities (logic-related vulnerabilities). This paper presents the business-layer dynamic application security tester (BLDAST) as a dynamic, black-box vulnerability-analysis approach to identify the business-logic vulnerabilities of a web application against DoS attacks. BLDAST evaluates the resiliency of web applications by detecting vulnerable business processes. The evaluation of six widely used web applications shows that BLDAST can detect the vulnerabilities with 100% accuracy. BLDAST detected 30 vulnerabilities in the selected web applications; more than half of the detected vulnerabilities were new and unknown. Furthermore, the precision of BLDAST for detecting the business processes is shown to be 94%, while the generated user navigation graph is improved by 62.8% because of the detection of similar web pages.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.613-616
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• 2011

Nowadays Web Services are one of the most rapidly developed technologies and have become platform for e-ecommerce as well as B2B model. Therefore, when Web Services use SOAP as a protocol for communication, their security should be considered. However, those SOAP messages are prone to XML attacks that can create a foundation for typical faults and make it vulnerable to use. Unfortunately, recent researches established that solutions to deal with these problems have several limitations. In this paper, we explore attacks on SOAP messages and also provide confidentiality and integrity solutions. It is a tolerant scheme which is able to automatically detect and fix typical faults occurred in SOAP messages to combat with the security threats in order to improve its reliability.

• Convergence Security Journal
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• v.7 no.4
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• pp.73-81
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• 2007

Users of World Wide Web (Web) experience difficulties in the retrieval of pertinent information due to the increased information provided by Web sites and the complex structure of Web documents that are continuously created, deleted, restructured, and updated. Web providers' efforts to maintain their sites are tend to be less than that of site creation due to the expenses required for maintenance. If information of relationship among Web documents and their validity is provided to Web managers as well as Web developers, they can better serve users. In order to grasp the whole structure of a Web site and to verify the validity of hyperlinks, traversal and analysis of hyperlinks in a Web document are required to provide information for effective and efficient creation and maintenance of the Web. In this paper, we introduce a Web Editor specialized for Web maintenance. We emphasized on two aspects: first, the analysis of HTML Tags to extract hyperlink information and second, establishment of the relationship among hyperlinked documents, and verification of the validity of them.