• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.1
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• pp.231-237
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• 2012

In 2011, Das proposed an effective biometrics-based remote user authentication scheme using smart cards that can provide strong authentication and mutual authentication, while eliminating the security drawbacks of Li-Hwang's scheme. In this paper, we have shown that Das's scheme is still insecure against several attacks and does not provide mutual authentication. Also, we proposed the enhanced scheme to overcome these security weaknesses, even if the secret information stored in the smart card is revealed. As a result of security analysis, the enhanced scheme is secure against user impersonation attack, server masquerading attack, off-line password guessing attack, and insider attack. And we can see that the enhanced scheme provides mutual authentication between the user and the server.

• Journal of the Korea Convergence Society
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• v.10 no.10
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• pp.1-6
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• 2019

As the value of technical information increases, hacking attacks are trying to steal technical information through hacking. Recently, hacking of cryptocurrency exchanges is much easier to monetize than existing technical information, making it a major attack target for hackers. In the case of technical information, it is required to seize the technical information and sell it to the black market for cashing.In the case of cryptocurrency, most hacking attacks are concentrated on cryptocurrency exchanges because it is easy to cash out and not easy to track when successful hacking. Although technology cannot be hacked, cryptocurrency transactions traded on cryptocurrency exchanges are not recorded on the blockchain which is simply internal exchanges, so insiders may manipulate the quotes and leave gaps or leak out. Therefore, this research analyzes the recent hacking attacks of cryptocurrency exchanges and proposes solutions to secure cryptocurrency trading.

• Convergence Security Journal
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• v.16 no.7
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• pp.139-145
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• 2016

Recently, The attack on the USB and network are increasing in many domestic infrastructure. These attacks are the most independent of insider intention, caused by the Anthropogenic Manipulation. These attacks are Anthropogenic Response Measures for Physical Security. and Representative Technology has CCTV, Access Control System, Sensor Technology. However, Physical Security, it is represented by several Product family according to the Market, has become an obstacle but rather a variety of Physical Security Technology Development and Application. As the Anthropogenic Attacks have occur continually in the network, it need to the proper Physical Response Techniques in this situation. Therefore, In this paper, we will find out about the awareness and demand trends of Physical Security. And The Physical Vulnerable Factors of Network. Thereby this is expected to be utilized as a basis for the domestic Physical Security Technology development and deployment Road-map in a future.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.1
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• pp.29-37
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• 2014

In this paper we show that a dynamic ID authentication scheme using smart cards proposed by Tsai et al. is not secure against DoS attack and insider attack. Further we claim that their scheme may raise a security problem when a user changes his/her password. Then we come up with a security-enhanced version only with small additional computational cost. Our scheme is based on the security of cryptographic hash function and the infeasibility assumption of discrete logarithm problem. In addition, we provide details of security and computational cost analysis.

• Journal of the Korea Society of Computer and Information
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• v.26 no.9
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• pp.89-96
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• 2021

In this paper, we analyzed that the user authentication scheme for TMIS(Telecare Medicine Information System) proposed by Al-Saggaf et al. In 2019, Al-Saggaf et al. proposed authentication scheme using biometric information, Al-Saggaf et al. claimed that their authentication scheme provides high security against various attacks along with very low computational cost. However in this paper after analyzing Al-Saggaf et al's authentication scheme, the Al-Saggaf et al's one are missing random number s from the DB to calculate the identity of the user from the server, and there is a design error in the authentication scheme due to the lack of delivery method. Al-Saggaf et al also claimed that their authentication scheme were safe against a variety of attacks, but were vulnerable to password guessing attack using login request messages and smart cards, session key exposure and insider attack. An attacker could also use a password to decrypt the stored user's biometric information by encrypting the DB with a password. Exposure of biometric information is a very serious breach of the user's privacy, which could allow an attacker to succeed in the user impersonation. Furthermore, Al-Saggaf et al's authentication schemes are vulnerable to identity guessing attack, which, unlike what they claimed, do not provide significant user anonymity in TMIS.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.7-10
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• 2007

최근 정보화 수준이 고도화 되고 대외 기술 교류가 활발해짐에 따라 기업 정보 유출에 의한 피해 사례가 급증하고 있고, 자료 유출 사례 중 전 현직 종사원인 내부자에 의해 발생되는 건이 80%이상을 차지하고 있어 내부정보 유출 방지체계에 대한 구축이 절실히 요구되고 있다. 내부 정보 유출 방지체계는 침입탐지시스템이나 방화벽 같은 외부 공격자에 대한 방어 대책으로는 한계가 있어 새로운 정보보호 체계가 필요하다. 본 논문은 내부정보 유통 구조에 내재되어 있는 내부정보 유출 취약점을 분석하고 이에 대한 대책으로서 정보보호 모델을 제안하며, 제안된 정보보호 모델을 구현하는 한 방법으로서 DRM 기술을 적용한 정보보호 기술구조를 제안하고 구현 시 고려사항을 기술한다. 제안된 기술구조는 조직에서 운용하고 있는 정보체계와 정보기기들을 관리영역으로 식별하는 방법을 제공하며 관리영역에서 비 관리영역으로의 자료 유통을 근본적으로 통제하는 장점을 갖고 있다.

• Review of KIISC
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• v.24 no.1
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• pp.23-31
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• 2014

대기업과 중소기업을 막론하고, 기업의 정보화는 기업의 지속가능한 발전을 위하여 필수불가결한 요소가 되어가고 있다. 또한, 기업들의 업무 프로세스는 기존의 정보화 시스템 및 신규 정보화 시스템 개발 및 보완을 통하여 전사적 단계로 진화되고 있으며, 자체적인 정보화 시스템 개발 및 운영인력을 보유하지 못하는 대다수의 기업들은 이러한 정보화 시스템 개발과 운영의 많은 부분을 기업 외부의 자원을 활용하는 아웃소싱에 위탁하여 수행하고 있다. 근래에 들어, 아웃소싱 인력을 포함한 내부자에 의한 정보유출 및 보안 사고의 규모는 매해 증가하고 있으나, 기업의 보안시스템은 해킹, 크래킹 등의 외부자 공격에 대한 방어위주로 구축되어 있다. 또한, 아웃소싱에 참여하고 있는 인력에 대한 적절한 기술적 관리적 보안체계의 수립이 미흡함으로써 발생하는 보안사고로 인하여 기업이 막대한 피해를 입는 사례가 나타나고 있다. 따라서, 아웃소싱 인력에 대한 보안수준을 향상하고 체계적인 아웃소싱 보안관리를 위한 가이드라인 수립이 필요한 시점이다. 본 연구에서는 기존의 선행연구를 조사하여 아웃소싱에 대한 보안 통제항목을 도출하고 도출된 보안 통제항목을 바탕으로 아웃소싱 보안수준을 높이기 위한 보안관리 추진방향을 제언하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.132-135
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• 2021

최근 네트워크의 확장으로 인한 공격 벡터의 증가로 외부자뿐 아니라 내부자를 경계해야 할 필요성이 증가함에 따라, 이를 다룬 보안 모델인 제로트러스트 모델이 주목받고 있다. 이 논문에서는 reverse proxy 와 사용자 패턴 인식 AI 를 이용한 제로트러스트 아키텍처를 제시하며 제로트러스트의 구현 가능성을 보이고, 새롭고 효율적인 전처리 과정을 통해 효과적으로 사용자를 인증할 수 있음을 제시한다. 이를 위해 사용자별로 마우스 사용 패턴, 리소스 사용 패턴을 인식하는 딥러닝 모델을 설계하였다. 끝으로 제로트러스트 모델에서 사용자 패턴 인식의 활용 가능성과 확장성을 보인다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.4
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• pp.647-656
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• 2020

Recently, there has been an increasing number of cases in which important data (personal information, technology, etc.) of national and public institutions are leaked to the outside world. Surveys show that the largest cause of such leakage accidents is "insiders." Insiders of organization with the most authority can cause more damage than technology leaks caused by external attacks due to the organization. This is due to the characteristics of insiders who have relatively easy access to the organization's major assets. This study aims to present an optimized property selection model for detecting such abnormalities through supervised learning algorithms among machine learning techniques using actual data such as CrossNet data transfer system transmission log, e-mail transmission log, and personnel information, which safely transmits data between separate areas (security area and non-security area) of the business network and the Internet network.

• Convergence Security Journal
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• v.17 no.5
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• pp.35-40
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• 2017

The control system can have such threats as information leakage and falsification through various routes due to communications network fusion with public network. As the issues about security and the infringe cases by new attack methods are diversified recently, with the security system that makes information data database by simply blocking and checking it is difficult to cope with new types of threats. It is also difficult to respond security threats by insiders who have security access authority with the existing security equipment. To respond the threats by insiders, it is necessary to collect and analyze Event Log occurring in the internal system realtime. Therefore, this study could find out whether there is correlation of the elements among Event Logs through correlation analysis based on Event Logs that occur real time in the control system, and based on the analysis result, the study is expected to contribute to studies in this field.