• Journal of the Korea Society of Computer and Information
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• v.19 no.9
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• pp.85-91
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• 2014

Encryption is a method to convert information to no-sense code in order to prevent data from being lost or altered by use of illegal means. Audit logging creates audit log of users' activities, exceptions, and information security events, and then conserves it for a certain period for investigation and access-control auditing. Our paper suggests that confidentiality and integrity of information should be guaranteed when transmitting and storing important information in encryption. Encryption should consider both one-way encryption and two-way one and that encryption key should assure security. Also, all history related to electronic financial transactions should be logged and kept. And, it should be considered to check the details of application access log and major information. In this paper, we take a real example of encryption and log audit for safe data transmission and periodic check.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.8
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• pp.1619-1625
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• 2017

Civil global navigation satellite system (GNSS) does not meet user performance requirements for specific PNT (Positioning, Navigation, and Time) applications. Therefore, various differential systems are used to augment GNSS for improving positioning accuracy and integrity. The MTSAT satellite augmentation system (MSAS) is the Japanese satellite based augmentation system. This paper is for analyzing the characteristics of Japanese MSAS in Korean peninsula. First of all, it was done for analyzing not only DGNSS navigation signal but also the navigation parameter through simulation and experimental tests. As a result of data analyses, the sufficient navigation satellites to determine 3-D position based on DGNSS are simultaneously available at MSAS monitering station and the southern region of Korean peninsula. It was verified that the carrier to noise signals are stable to maintain the reliable 3-D position and that the level of 2m (2drms) accuracy is very similar to the ordinary worldwide DGNSS as well.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.11a
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• pp.165-168
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• 2019

The advancement in technology has led to the enormous use of multimedia applications. The video/image recorded by such applications provides critical information that can be used as a visual evidence. However, owing to the adequacy in using different editing tools, it is susceptible to malicious alterations. Thus, the reliability or the integrity of the visual information should be verified before using it as an evidence. In this paper, we propose an integrity verification method for the surveillance system using randomized hashing. The integrity value of the surveillance data is generated using the randomized hashing and elliptic curve cryptography (ECC), which is used later for the validation. The experimental results obtained from the embedded accident data recorder (ADR) system shows that the proposed method is very efficient and provides a high level of security.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.130-132
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• 2008

전력계통에서 사고는 커다란 물질적 피해를 야기하는 것으로 미연의 사고방지 및 예방이 필수적이다. 현재 전력계통 시스템은 대부분이 이중, 삼중의 보호 시스템과 후비 시스템 등을 갖추어 기계적인 고장이나 오작동으로 인한 사고를 최소화 하고 있다. 하지만 실제 계통을 감시하고 운영하는 운영자에게 잘못된 정보가 들어옴으로 인한, 잘못된 조작은 계통에서 정상적인 기기 제어에 해당되므로 잘못된 조작으로 정전 사고가 발생한다 하더라도 이를 막아줄 수 있는 대책이 없게 된다. 따라서 계통 정보의 무결성을 검사하고 계통에서 전달되는 데이터가 정상임을 확인하는 판단이 필요하게 되며 이를 통해 운영자에게 정확한 정보를 볼 수 있게 하기 위해 현재 상태를 확인하고 잘못된 정보가 들어온 것을 계통 상태를 통해 확인할 수 있는 알고리즘을 제시한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.244-248
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• 2002

In the process of various appliance changing analogical way into digital way, we look over DVR in the field of security and supervision, and then suggest DVR system which use watermarking technology based on UT. It considers and embodies the ability of rapid processing and clear image which are required in real DVR market. At this point we have watermark in DVR file and guarantee none defectiveness so that it can be used as evidence of theft and etc.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.282-285
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• 2007

최근 금융, 공공기관 등에서 개인 정보 유출이 빈번해짐에 따라 사회적으로 심각한 문제가 발생하고 있다. 한국산업기술진흥협회의 조사에 따르면, 이런 정보 유출이 외부의 불법적 시스템 침입으로 인해 발생하는 것보다, 대부분 데이터 접근이 인가된 내부자 소행으로 나타나고 있다. 이는 데이터베이스의 보안 취약성으로 인해, 내부의 비인가자 또는 인가자의 데이터 접근에 대한 통제 정책이 제대로 이루어지지 않기 때문이다. 이에 따라, 본 논문에서는 클라이언트에서 데이터베이스 서버로 요청되는 네트워크상의 패킷 분석을 통한 데이터베이스의 접근통제방법을 제안한다. 제안된 보안모델에서는, 사용자 정보 및 SQL 의 위 변조를 방지하기 위해서 공개키 인증과 메시지 인증코드 교환으로 무결성을 확보하였다. 또한 권한별 테이블의 컬럼 접근통제를 확장하기 위해서 데이터 마스킹 기법을 구현하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.4
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• pp.873-880
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• 2015

Since hardware-based kernel-integrity monitoring systems run in the environments that are isolated from the monitored OS, attackers in the monitored OS cannot undermine the security of monitoring systems. However, because the monitoring is performed by using physical addresses, the hardware-based monitoring systems are vulnerable to Address Translation Redirection Attack (ATRA) that manipulates virtual-to-physical memory translations. To ameliorate this problem, we propose a scheduler-based ATRA detection method. The method detects ATRA during the process scheduling by leveraging the fact that kernel scheduler engages every context switch of processes. We implemented a prototype on Android emulator and TizenTV, and verified that it successfully detected ATRA without incurring any significant performance loss.

• Journal of the Korean Society for Railway
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• v.14 no.5
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• pp.416-424
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• 2011

The recent development of USN (Ubiquitous Sensor Network) technology has broadened its applications to many fields of industry. The USN technology enables the system to monitor and control the status of distributed sensor nodes based on the low-powered communications. Applying the USN in the train control domain, the operational efficiency can be enhanced, where the reliability and the safety of the system are the key challenges. This paper suggests the system design for evaluating and improving the reliability and safety of the gateway, which is a USN component that manages the radio network among the sensors and collects the information from them. For this purpose, the reliability and the level of safety integrity of a general gateway have been predicted quantitatively and the supplementary design has been proposed for the selected week points. The verification on the reliability and the safety of the improved gateway according to the related standards has been followed. With the results of the study, the applicability of USN gateway for train control systems has been reviewed.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1793-1794
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• 2006

네트워크 전력계측 장치는 전국의 수용가 측에 설치되며 전력품질을 감시할 수 있는 단말기와 표준화된 이더넷망(유무선)을 사용한 네트워크 환경과 전국의 전력품질 데이터를 수집할 수 있는 서버로 크게 구성된다. 본 논문에서는 128 샘플링으로 계측되는 전력품질계측 단말기를 구현하고 전력품질 분석 알고리즘을 고안하였으며 이더넷망을 이용하여 전력품질 데이터를 수집하고 수집데이터를 분석하여 전력 품질에 대한 분석을 하였다. 뿐만아니라 전력품질에 영향을 주는 고조파신호들과 OVER/UNDER 전압과 전류 및 주파수, SAG, SWELL, INTERRUPT등을 인식하여 해당 데이터를 메모리에 저장하는 일련의 알고리즘을 연구하였으며 이렇게 저장된 정보를 이더넷망에서 무결성과 신뢰성이 있게 고속으로 전송받을 수 있는 통신 프로토콜에 관한 연구가 수행하였다. 뿐만 아니라 응용프로그램에서 소프트에웨어적인 필터링 기법과 분석알고리즘을 연구하여 이상신호에 대한 원인 판단이 가능하도록 연구한다. 본 논문은 네트워크(인터넷/이더넷)와 전력품질계측 관련 방법론과 SERVER개념을 도입한 유비쿼터스에서 센서네트워크 기법을 전력산업에 융합하려는 연구에 그 요점이 있다.

• Korean Journal of Remote Sensing
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• v.25 no.5
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• pp.391-398
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• 2009

Variations of mean ionospheric spatial gradient over Korea are analyzed in order to support GNSS (Global Navigation Satellite System) augmentation systems and integrity monitering systems. A software for analyzing the ionospheric spatial gradient is developed using an ionospheric plate model. Daily and annual variations of ionospheric delay and spatial gradient are analyzed using GPS data in 2003 and 2005 respectively. The ionospheric delays and spatial gradients in 2003 were larger than 2005. Also, the south-north gradient, about -1.0mm/km, is nearly two times larger than the east-west gradient. The annual ionospheric spatial gradients over Korea is varied within 2mm/km.