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안드로이드 환경의 OAuth 프로토콜을 이용한 원격지 데이터 수집 방법 연구
남기훈,공성현,석병진,이창훈 한국정보보호학회 2018 정보보호학회논문지 Vol.28 No.1
Using OAuth protocol, third-party applications on the Android operating system use user's credentials or access tokensthat have access authority on user's resources to gain user's account and personal information from account informationproviders. These credentials and token information are stored in the device by the OAuth data management method providedby the Android operating system. If this information is leaked, the attacker can use the leaked credential and token data toget user's personal data without login. This feature enables the digital forensic investigator to collect data directly from theremote server of the services used by the target of investigation in terms of collecting evidence data. Evidence datacollected at a remote location can be a basis for secondary warranties and provide evidence which can be very importantevidence when an attacker attempts to destroy evidence, such as the removal of an application from an Android device. Inthis paper, we analyze the management status of OAuth tokens in various Android operating system and device environment, and show how to collect data of various third party applications using it. This paper introduces a method of expanding thescope of data acquisition by collecting remote data of the services used by the subject of investigation from the viewpointof digital forensics. 안드로이드 운영체제의 서드파티 애플리케이션들은 사용자의 계정 및 개인정보에 대한 접근 권한을 획득하기 위해 OAuth 프로토콜을 이용하여 계정 정보 제공자들로부터 사용자의 크리덴셜 및 사용자의 자원에 접근할 수 있는권한을 내포하는 접근 토큰을 전달받는다. 이러한 크리덴셜 및 토큰 정보는 안드로이드 운영체제가 제공하는OAuth 관련 데이터 관리 방식에 의해 기기 내부에 저장되는데, 이 정보가 유출될 경우 공격자는 유출된 크리덴셜및 토큰 정보를 이용하여 사용자의 계정에 대한 자유로운 로그인 및 데이터 접근이 가능하다. 이러한 특징은 디지털포렌식 수사관이 증거 데이터를 수집하는 관점에서 피압수자가 사용하는 서비스의 원격지 서버로부터 직접 데이터를수집하는 것을 가능하게 한다. 원격지에서 수집되는 증거 데이터는 2차적인 영장발부의 토대로 작용함으로써 수집한디지털 증거의 증거능력을 확보할 수 있기 때문에 피압수자가 안드로이드 기기에서 애플리케이션 삭제 등의 증거 인멸을 시도한 경우 매우 중요한 증거가 될 수 있다. 본 논문에서는 다양한 안드로이드 운영체제 및 기기 환경에서OAuth 토큰의 관리 현황을 분석하고, 이를 이용하여 다양한 서드파티 애플리케이션의 데이터를 수집하는 방법을소개한다. 이를 통해 디지털 포렌식 관점에서 피압수자가 사용하는 서비스의 원격지 데이터를 수집함으로써 증거 수집의 영역을 확장할 수 있는 방안을 제안한다.
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이승우(S. W. Lee),송준엽(J. Y. Song),이화기(H. K. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Compound semiconductor manufacturing environment also has been emerged as mass customization and open foundry service so integrated manufacturing system is needed. In this study, we design data acquisition system of compound semiconductor fabrication that has monitoring and control of process. The developed DAS is consisted of key-in system inputted by operator and automatic acquisition system by GEM protocol. And we implemented them in the actual compound semiconductor. It is expected that using developed system would offer precise process information to buyer, reduce a lead-time, and obey a due-dates and so on.
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유량 데이터 오차율 분석을 통한 최적의 유량데이터 취득방안 제안
김윤하,최현주 대한상하수도학회 2017 상하수도학회지 Vol.31 No.3
Recently, application areas based on M2M (Machine-to-Machine communications) and IoT (Internet of Things) technologies are expanding rapidly. Accordingly, water flow and water quality management improvements are being pursued by applying this technology to water and sewage facilities. Especially, water management will collect and store accurate data based on various ICT technologies, and then will expand its service range to remote meter-reading service using smart metering system. For this, the error in flow rate data transmitting should be minimized to obtain credibility on related additional service system such as real time water flow rate analysis and billing. In this study, we have identified the structural problems in transmitting process and protocol to minimize errors in flow rate data transmission and its handling process which is essential to water supply pipeline management. The result confirmed that data acquisition via communication system is better than via analogue current values and pulse, and for communication method case, applying the industrial standard protocol is better for minimizing errors during data acquisition versus applying user assigned method.
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黃宗奎(Jong-Gyu Hwang),李在浩(Jae-Ho Lee),趙賢庭(Hyun-Jeong Jo),李鐘宇(Jong-Woo Lee) 대한전기학회 2006 전기학회논문지 B Vol.55 No.9
According to the computerization of railway signaling systems, the interface link between the signaling systems has been replaced by the digital communication channel. At the same time, the importance of the communication link is more pronounced than before. In this paper, new Network-based protocol between railway signaling and SCADA (Supervisory Control and Data Acquisition system) has designed and the overview of designed protocol is briefly represented. And also this paper addresses an analysis of newly designed train control systems. Fame error rates of the data transmissions are calculated and compared for the two cases that the CTC (Centralized Traffic Control)/SCADA has an extra data transmission error control (CRC16) besides the inherent error control of the Ethernet and that the CTC/SCADA has no extra data transmission error control. With simulation results it has been verified that the additional error control code contributes to lowering the frame error rate. It will be expected to increase the safety, reliability and efficiency of maintenance of the signaling systems by using the designed protocol for railway signaling system.
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