• Journal of the Korea Society of Computer and Information
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• v.11 no.1 s.39
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• pp.35-44
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• 2006

As the E-commerce and E-business are developed actively, using certificate is incremented rapidly. The certificate validation must be confirmed at first in E-commerce and the OCSP Responder can offer CSI to the client using OCSP. With the rapid development of the E-commerce based on the Internet, a lot of clients request CSI to OCSP Responder. So, the load to OCSP Responder is increased and the OCSP Responder may be overloaded. Therefore, for distributing the load to an OCSP Responder, D-OCSP is introduced. As the CRL has a lot of information about revoked certificates and have a high exposure Possibility of information in the process of distribution, the confidentiality as well as integrity are required in the process of distribution. So, we propose a CRL distributing method based on group key agreement in D-OCSP. The proposed method can distribute effectively a published CRL to OCSP Responders with confidentiality as well as integrity and offer concurrency that each OCSP Responder can start CSI servicing of new CRL to clients at the same time.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.625-628
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• 2013

기술이 발달함에 따라 USB메모리, 보안 SD카드, 보안인증토큰 등 이동형 저장 매체도 비약적인 발전을 하고 있다. USB의 가격이 저렴해지고 작아지면서 용량의 확장도 증가하여 다양한 이용을 할 수 있게 되었다. 하지만 분실율이 높고 보안성이 낮아 다수의 사용자에게 중요한 회사의 기밀이나 개인의 인적 사항들이 노출 될 수 있다. 이를 위해 PUF를 이용하여 플래시 메모리 마다 고유키를 저장, 생성하여 외부 유출이 없이 사용자 인증을 하기 위한 플래시 드라이버의 구조 및 프로토콜을 제안하고자 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.6
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• pp.13-20
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• 2011

Nowadays, digital-images are widely used at Web, industrial and medical applications. There have been many studies on online and Web copyright. But there are a few studies on industrial digital-image. In this paper, we propose the image encryption scheme for digital image in the industrial film. We implement and verify the proposed digital image encryption scheme for prevention of industrial secrets and intellectual property right outflow.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.800-803
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• 2011

악성코드에 감염된 여러 대의 좀비 PC가 특정 사이트를 공격하는 해킹 방식인 DDoS 공격은 최근 7.7 DDoS 대란을 비롯하여, 1년도 채 되지 않아 3.3 DDoS 대란으로 이어지고 있다. DDoS 대란의 발생을 통해 사이버 보안 위협의 위험성이 점차 증가하고 있음을 확인할 수 있으며, 공격 경로를 통해 사용자 PC로 유입된 악성코드는 사용자의 자산인 PC에 저장되어 있는 정보들을 모두 삭제할 수 있어 공격으로 인해 발생하는 금전적, 정신적 피해가 점차 심각해지고 있다. 이러한 환경에서 조직 및 사용자가 보존해야 할 정보 자산의 기밀성, 무결성, 가용성을 실현하기 위하여 정보보호관리체계를 기반으로 지속적인 점검을 수행하여 조직 내의 위기관리 프로세스가 구축되어야 한다. 따라서 본 논문에서는 기업이 보유하고 있는 정보 자산이 외부로 유출되는 것을 방지하고, 악의적인 악성코드가 내부로 유입 되어 조직 내부의 자산을 파괴하는 위협으로부터 보안을 제공하기 위한 정보보호관리체계에 대해서 분석하고, 기업 정보보안 기능을 강화할 수 있는 방안에 대하여 제안하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.12 no.1 s.45
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• pp.107-116
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• 2007

Is need Remote Access through internet for business of Ubiquitous Computing age, and apply OTP for confidentiality about inputed ID and Password, network security of integrity. Current OTP must be possessing hardware of Token, and there is limitation in security. Install a Snooping tool to OTP network in this treatise, and because using Cain, enforce ARP Cache poisoning attack and confirm limitation by Snooping about user password. Wish to propose new system that can apply Tokenless OTP by new security way, and secure confidentiality and integrity. Do test for access control inflecting Tokenless OTP at Remote Access from outside, and could worm and do interface control with certification system in hundred. Even if encounter hacking at certification process, thing that connection is impossible without pin number that only user knows confirmed. Because becoming defense about outward flow and misuse and hacking of password when apply this result Tokenless OTP, solidify security, and evaluated by security system that heighten safety.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.4
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• pp.43-48
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• 2017

Today our society is approaching new intelligence information society, which has been caused by the Fourth Industrial Revolution along with the development of information and communication technology(ICT). And this has just opened a new era of Internet of Things(IoT) that connects between human and objects and between objects through network, allowing transmission and reception of information beyond the limits of space. However, many crises occurred in the existing communication environment may threaten the security of Internet of Things, by violating the three components of information security. In this paper, this study aims to analyze security technology to achieve advanced security by dividing IoT security technology for coping with security vulnerability found in different components into three groups.

• Journal of the Korea Society of Computer and Information
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• v.29 no.7
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• pp.81-88
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• 2024

Despite the rapid growth of the generative AI market and significant interest from domestic companies and institutions, concerns about the provision of inaccurate information and potential information leaks have emerged as major factors hindering the adoption of generative AI. To address these issues, this paper designs and implements a question-answering system based on the Retrieval-Augmented Generation (RAG) architecture. The proposed method constructs a knowledge database using Korean sentence embeddings and retrieves information relevant to queries through optimized searches, which is then provided to the generative language model. Additionally, it allows users to directly manage the knowledge database to efficiently update changing business information, and it is designed to operate in a private network to reduce the risk of corporate confidential information leakage. This study aims to serve as a useful reference for domestic companies seeking to adopt and utilize generative AI.

• Journal of KIISE
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• v.45 no.3
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• pp.294-302
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• 2018

With the emergence of the new service industry due to the development of information and communication technology, cyber space risks such as personal information infringement and industrial confidentiality leakage have diversified, and the security problem has emerged as a critical issue. In this paper, we propose a behavior-based anomaly detection method that is suitable for real-time and large-volume data analysis technology. We show that the proposed detection method is superior to existing signature security countermeasures that are based on large-capacity user log data according to in-company personal information abuse and internal information leakage. As the proposed behavior-based anomaly detection method requires a technique for processing large amounts of data, a real-time search engine is used, called Elasticsearch, which is based on an inverted index. In addition, statistical based frequency analysis and preprocessing were performed for data analysis, and the DBSCAN algorithm, which is a density based clustering method, was applied to classify abnormal data with an example for easy analysis through visualization. Unlike the existing anomaly detection system, the proposed behavior-based anomaly detection technique is promising as it enables anomaly detection analysis without the need to set the threshold value separately, and was proposed from a statistical perspective.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.4
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• pp.987-997
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• 2018

Blockchain has tamper-free, so many applications are developing to leverage tamper-free features of blockchain. MIT Media Labs proposed BlockCerts, educational certificate blockchain System, to solve problems of legacy certificate verifications. Existing educational certificate blockchain Systems are based on public blockchain such as bitcoin, Ethereum, so any entity can participate educational institute in principal. Moreover, the exisitng educational certricate blockchain system utilizes the integrity of blockchain, but the confidentiality of the educational certificate is not provided. This paper propose a digital certificate system based on private blockchain, name HyperCerts. Therefore, only trusted entity can participate in the private blockchain network, Hyperledger, as the issuer of digital certificate. Furthermore, the practical byzantine fault tolerance is used as consensus algorithm, HyperCerts reduce dramatically the latency of issuing digital certificate and required computing power. HyperCerts stores the hash value of digital certificate into the ledger, so breach of personal information by malicious entity in the private blockchain is protected.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.6
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• pp.1439-1448
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• 2018

Many electronic document files, including Microsoft Office Word (MS Word), have become a major issue in various legal disputes such as privacy, contract forgery, and trade secret leakage. The internal metadata of OOXML (Office Open XML) format, which is used since MS Word 2007, stores the unique Revision Identifier (RSID). The RSID is a distinct value assigned to a corresponding word, sentence, or paragraph that has been created/modified/deleted after a document is saved. Also, document history, such as addition/correction/deletion of contents or the order of creation, can be tracked using the RSID. In this paper, we propose a methodology to investigate discrimination between the original document and copy as well as possible document file leakage by utilizing the changes of the RSID according to the user's behavior.