• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.11C
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• pp.1090-1096
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• 2002

The HTTP does not support continuity for browser-server interaction between successive visits or a user due to a stateless feature. Cookies were invented to maintain continuity and state on the Web. Because cookies are transmitted in plain and contain text-character strings encoding relevant information about the user, the attacker can easily copy and modify them for his undue profit. In this paper, we design a secure cookies scheme based on X.509 public key certificate for solving these security weakness of typical web cookies. Our secure cookies scheme provides not only mutual authentication between client and server but also confidentiality and integrity of user information. Additionally, we implement our secure cookies scheme and compare it to the performance with SSL(Secure Socket Layer) protocol that is widely used for security of HTTP environment.

• Journal of Internet Computing and Services
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• v.19 no.2
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• pp.27-32
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• 2018

In industries that are operating various enterprise systems, new systems are integrated and operated in accordance with each period. In particular, when a new system is to be integrated, one of the major considerations is the single sign-on part for integrating and operating the authentication. To implement this authority system using role-based access control method, an extension method for access control method is needed. Therefore, in this paper, we design an extended role-based access control model for interworking with legacy authority system and provide its APIs. The extended role-based access control model is a model in which external authority information, which holds authority information in the authority information, is added. And we describe operations that the REST Web APIs are based on these models. In this paper, the method is described in the back-end APIs and can be implemented as an operation of an extended role-based access control system based on the method.

• Journal of the Korea Society of Computer and Information
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• v.7 no.2
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• pp.124-129
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• 2002

Currently, image processing are used widely and have various types of characteristics with the applications of VOD(Video on demand), the web casting services, the video conference systems and virtual realities. Using the scene change, at every time of video image transitions, an editor can classify the video context and also require a function of in(Boxing insertion. Digital watermarking provides a solution to illegal copying of digital contents and has many other useful applications, including web broadcast monitoring, transaction tracking, authentication, copy control and device control. The Purpose of this thesis is to implement of nonlinear moving picture editor for the multiple watermarking. For the effective watermarking performance, this thesis considers the protection of image quality reduction and robustness for hiding information concurrently.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.1961-1964
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• 2003

웹서비스에 대한 높은 관심과 함께 그 실현이 점차 가시화되고 XML로 이루어진 지원 기술들의 전폭적인 지지로 잠재력은 더욱 확대되고 있다. 웹서비스는 기존 웹 기반의 디스플레이에 그쳤던 단순정보 교환을 애플리케이션 차원에서 데이터를 통신할 수 있어 개발 가능성이 무한한 프레임워크로 각광받고 있다. 전자상거래 분야도 예외는 아니어서 웹서비스의 기본 개념을 이용하여 프레임워크를 구성하려는 노력이 진행되고 있다. 이에 따라 인증분야에서도 한계점이 드러나게 되었고 각 시스템마다 존재하는 많은 인증 정보관리 문제가 부각되고 있다. OASIS에서는 웹서비스의 등장과 함께 SAML이라는 표준 인증 방식을 제시하였다. SAML은 XML기반의 표준화된 인증방식을 취하여 안전성과 확장성 뿐만 아니라 인증 간 상호운용성을 제공하는 강력한 기능을 가지고 있다. 본 논문에서는 SAML을 이용한 SSO(Single Sign On)와 접근권한에 대한 적용개념을 소개하고 SAML인증서버를 이용한 Web Services인증 모델을 제시하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.1125-1128
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• 2019

사용자가 인터넷을 사용할 때 화면에 표시되는 텍스트나 그래픽 등을 웹 문서라고 하며 HTML5는 웹 문서를 제작하는 표준 언어의 일종이다. HTML5 중에서 web storage는 사용자가 인터넷을 통한 서비스를 받을 때 데이터를 저장하기 위한 기능으로 키와 값의 형태로 저장한다. web storage는 서버 측에서 사용되는 session storage와 클라이언트에서 사용되는 local storage가 있다. local storage 사용 시 데이터를 클라이언트에 평문 형태로 저장하며 만료 기간 없이 영구적인 특징을 갖고 있다. 이러한 특징은 공격자로부터 XSS 등의 공격에서 저장된 데이터의 접근 및 수정 그리고 탈취할 수 있어 공격자의 의도에 따라 데이터 가공 및 재사용이 가능하다는 문제가 있다. 보안 취약점 문제를 해결하기 위한 최근 연구들은 local storage에 저장된 데이터들을 암호화하여 기밀성을 높였다. 그러나 데이터 암호화를 사용하려면 잦은 암호 입력이나 온라인에서만 사용할 수 있다는 또 다른 문제점을 가지고 있다. 기존 보안 취약점 문제와 기존 연구의 문제점을 동시에 해결하기 위해 운영체제 사용자 정보와 기기의 정보를 활용하여 암호화에 필요한 사용자 인증을 자동화하였으며 검증을 위해 코드를 구현하고 테스트 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.853-856
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• 2012

모바일 디바이스의 대중화와 SNS(Social Networking Service)의 발전은 각 개인이 데이터와 정보를 생성하는 Web 2.0 의 페러다임을 앞당겼으며 최근 SNS 서비스를 통하여 새로운 형태의 커뮤니케이션 형태가 생성되었다. 이러한 커뮤니케이션 도구를 이용하는 유저는 대부분 ID 와 Password를 기반으로 사용자를 인증하여 서비스를 제공받는다. 이와 같은 서비스에서는 각 사용자의 정보자체보다 사용자의 사회적 위치와 사용자간의 관계를 이용한 보안사고가 우려된다. 근래의 ID/Password로 인증하는 방식의 웹서비스 또는 정보서비스들은 대부분 개인 PC, 스마트폰, 업무 PC 등에서 접근하는 추세이며, 임의적 장소에서 임의의 기기로 해당 서비스에 접근하는 양상은 과거에 비하여 감소하는 추세다. 이 같은 추세에 따라, 주로 사용하는 기기에 HTML5의 keygen과 Web-Storage 기능을 사용하여 암호화된 Key를 생성하고 저장하여 ID 와 Password가 노출되어도 해당 기기가 아니면 인증되지 않는 시스템을 구현 할 수 있으며 타 기기의 경우 일회성을 갖는 인증 방식을 사용하여, 기존 보다 안전한 인증 시스템을 적은 비용으로 구축 할 수 있다.

• Journal of Korea Society of Digital Industry and Information Management
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• v.15 no.1
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• pp.53-59
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• 2019

As the number of harmful sites increases, many social problems are occurring. Therefore, in order to solve this problem, the government is carrying out activities to block access to web sites to harmful sites based on the law. However, due to the change from HTTP to HTTPS protocol, it has become difficult to block the harmful sites in the existing method. In the existing HTTP protocol, a method of blocking the site corresponding to the harmful site domain list by utilizing the DNS information was used. However, due to the generalization of HTTPS, it is difficult to block the harmful sites in the existing method. Therefore, the ISP uses the method of blocking the website using the SNI field in the TLS (Transport Layer Security) Handshake protocol used for HTTPS. However, since the method using SNI field raises the concern of monitoring Internet users or exposing information about connected sites, in this paper, we proposed method which can support anonymity to Internet users while blocking harmful sites. The suggested method also can support integrity and source authentication to the transmitted data.

• Journal of the Korean Society of Industry Convergence
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• v.27 no.1
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• pp.143-149
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• 2024

The production and procurement of shipbuilding and offshore equipment is an important competitive factor in the shipbuilding and offshore industry. Recently, ICT-based digital technology has been rapidly applied to the manufacturing industry following the Fourth Industrial Revolution. Under the digital transformation, real-time data interface technology based on SCM (Supply Chain Management) is emerging as an important tool to improve the efficiency of the equipment manufacturing process. In this study, the characteristics and advantages and disadvantages of interface technologies of web-based data interface technologies were compared and analyzed. The performance was compared between theoretical evaluation based on technical features and practical application cases. As a result, it was confirmed that GraphQL is useful for selective data processing, but there is a problem with optimization, and REST API has a problem with receiving data due to a fixed data structure. Therefore, this study aims to suggest ways to utilize and optimize these data interface technologies.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.3
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• pp.1428-1438
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• 2013

Services take place in Internet environment, a formation of the trust relationship between user and service provider for services. Different authentication schemes such as using Certificate of Public Key Infrastructure authentication and using ID/PW for a simple user authentication have been proposed for trust relationship. In addition, in the case of electronic financial transactions, transaction integrity and non-repudiation features are provided. These services are provided in Internet environment, use various measures to ensure service safety. However, it was difficult to prevent attacks using existing security technology because of emergence of MITB attack that manipulate the memory area of the Web browser and social engineering attacks such as phishing/pharming, requires application of new security technologies became. In this paper, we propose a concept of smart secure-pad, and utilize it safely formed a trust relationship between user and service provider, a model has been proposed to ensure safety of data transmission. Proposed model's security evaluation results show security against to MITB attack and phishing/pharming that can't be prevent attack using existing security technology. In addition, service provider can easily apply the model in safe environment can provide Internet service using provided representative services applying the proposed model.

• Convergence Security Journal
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• v.8 no.1
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• pp.1-7
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• 2008

The hacking method came to be more complicated, became program ant it was automated. That is hacking trend of recent times. Before, The password crack, catch root authority is trend of hacking which uses the vulnerability of server. Hacker attack network or all of domain not some host. Web application system at hacking technique develops and improve transmitted data through the network shows many vulnerability. The massive data are transmitted through the network without encipherment filtering. It will be able to bring about the neck of a bottle actual condition which is serious in security system because of the network where the user comes to be many it leads and the data which is delivered comes to be many. In this paper, we propose web application system to prevent overload from bottleneck in encipherment system. It can solve security key trust problem in encoding and decoding with public key infrastructure.