• Journal of Internet Computing and Services
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• v.14 no.3
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• pp.35-46
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• 2013

As mobile terminal environment gets matured, the use of Android platform based mobile terminals has been growing high. Recently, the number of attacks by malicious application is also increasing as Android platform is vulnerable to private information leakage in nature. Most of these malicious applications are easily distributed to general users through open market or internet and an attacker inserts malicious code into malicious app which could be harmful tool to steal private data and banking data such as SMS, contacts list, and public key certificate to a remote server. To cope with these security threats more actively, it is necessary to develop countermeasure system that enables to detect security vulnerability existing in mobile device and take an appropriate action to protect the system against malicious attacks. In this sense, this paper aggregates diverse system events from multiple mobile devices and also implements a system to detect attacks by malicious application.

• Journal of Internet Computing and Services
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• v.19 no.5
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• pp.13-19
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• 2018

Although it's been nearly decade since the electronic notarization system enforced, the utilization is not high because of the troublesomeness of the client or his agent to visit the notarial office directly. Recently, the ministry of justice introduced e-notary based on audio-visual conference through amendament of the notarial law, and hence it will vitalize the usage of e-notary. In addition, due to the spread of smartphones, many people use SMS messages to express simple statements or promises. However, in case of legal disputes, the judgment of the court is different according to the case. The electronic notarization system can be used to prove of evidence of SMS messages, however, there is a hassle to convert SMS messages to electronic documents. To solve this problem, this paper proposes an SMS notarization system using smartphones. The proposed system uses reliable notarization server and it is divided into notarization system for message senders and notarization system for message receivers according to notary requestor.

• Journal of KIISE:Computing Practices and Letters
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• v.12 no.6
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• pp.367-378
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• 2006

A mobile phone has became as a payment tool in e-commerce and on-line banking areas. This trend of a payment system using various types of mobile devices is rapidly growing, especially in the Internet transaction and small-money payment. Hence, there will be a need to define its standard for secure and safe payment technology. In this thesis, we consider the service types of the current mobile payments and the authentication method, investigate the disadvantages, problems and their solutions for smart and secure payment. Also, we propose a novel authentication method which is easily adopted without modification and addition of the existed mobile hardware platform. Also, we present a simple implementation as a demonstration version. Based on virtual machine (VM) approach, the proposed model is to use a pseudo-random number which is confirmed by the VM in a user's mobile phone and then is sent to the authentication site. This is more secure and safe rather than use of a random number received by the previous SMS. For this payment operation, a user should register the serial number at the first step after downloading the VM software, by which can prevent the illegal payment use by a mobile copy-phone. Compared with the previous SMS approach, the proposed method can reduce the amount of packet size to 30% as well as the time. Therefore, the VM-based method is superior to the previous approaches in the viewpoint of security, packet size and transaction time.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.3
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• pp.479-490
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• 2013

Recently, the number of attacks by malicious application has significantly increased, targeting Android-platform mobile terminal such as Samsung Galaxy Note and Galaxy Tab 10.1. The malicious application can be distributed to currently used mobile devices through open market masquerading as an normal application. An attacker inserts malicious code into an application, which might threaten privacy by rooting attack. Once the rooting attack is successful, malicious code can collect and steal private data stored in mobile terminal, for example, SMS messages, contacts list, and public key certificate for banking. To protect the private information from the malicious attack, malicious code detection, rooting attack detection and countermeasure method are required. To meet this end, this paper investigates rooting attack mechanism for Android-platform mobile terminal. Based on that, this paper proposes countermeasure system that enables to extract and collect events related to attacks occurring from mobile terminal, which contributes to active protection from malicious attacks.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.541-544
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• 2015

Through the data communication services in the mobile field in the past of a voice call center (SMS, E-Mail, web surfing, etc.), it has evolved as a "service of smartphone-based" life convenience. According to the latest world book publishing market statistics, the while increasing the proportion of e-books, the proportion of this paper are commercially being reduced. Paper this many e-books in the development of, but active communication in this paper By fusing an NFC-based mobile environment that provides a function to complement the disadvantage of electronic books has, it can give to meet the matters required in more diverse applications. Therefore, in this paper, in order to design and implement an NFC-based mobile phonic fairy book application of, and the efficiency and maintenance of the development through a way to save on rather than storing the information of the management target device server We have implemented a NFC-based mobile education phonic fairy book application that takes into account.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.323-331
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• 2013

There are three ways how to extract forensic evidence from mobile phone, such as SYN, JTAG, Revolving. However, it should be a different way to extract forensic evidence due to the differences of their usage and technology between them(mobile phone and smart phone). Therefore, in this paper, I will come up with extraction method that forensics evidence by search and seizure of a smart phone. This study aims to analyze specifications and O.S., backup analysis, evidence in smart to analyze for search and seizure of a smart phone commonly used google android and windows mobile smart phone. This study also aim to extract forensics evidence related to google android and phone book, SMS, photos, video of window mobile smart phone to make legal evidence and forensics report. It is expected that this study on smart phone forensics technology will contribute to developing mobile forensics technology.

• The Journal of the Korea Contents Association
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• v.8 no.8
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• pp.74-80
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• 2008

Various mobile contents have been developed with the spread of cellular phones. Above all things, nowadays, an idle application services are developed through competition in mobile phone manufacturers and mobile communication companies. In this paper, we propose that the idle application with text message service is easy to receive and edit. It is complement to function of SMS in use and can be effective information managing method, for example, it arrays messages and uses diary feature to set permissions when it send and receive standardized text message. We expect that proposed service will be adopted without additional cost in wireless units.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.781-793
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• 2010

Recently, owing to the development of ubiquitous sensor network and mobile communication technologies, many studies on healthcare system are being carried out. In this paper, we have designed and implemented a mobile u-Healthcare system based on sensor network. The u-Healthcare system is composed of three components: wireless sensor network at home, healthcare center located at remote site, and gateway which relays sensing physiological signals to healthcare center. In order to measure patient's physiological signal three sensors are used: three channel ECG sensor, pulse oximeter, and blood pressure sensor. Each sensor is mounted on a mote which can send gathered signal to the base node using Zigbee communication protocol. Once the base node receives physiological signal from each sensor, the client in the base node transfers the signal to the healthcare center. The received physiological signal at the healthcare center is analyzed and processed using various algorithms. The processed results are compared to the standard healthcare database and appropriate treatment including dietetics and exercise cure would be sent to the patient as feedback using SMS message or healthcare center web site. Each patient can check and manage one's health state every day using the healthcare system and gain a recovery under the treatments from minor health problems.

• Journal of Digital Convergence
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• v.4 no.2
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• pp.127-142
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• 2006

This paper uses a Mobilans case based on software system to derive the results of our study. Recently, the mobile phone payment entered its matured stage and became most frequently used payment method in all internet sites. And, in order to prepare for the future ubiquitous market, every mobile phone payment methods has different speed of development, market status and target segments in the market. This paper also discusses about the background and current status of Korean mobile phone payment market using SMS(Short Message Service) to purchase items on internet which is growing sharply every year. Also, we try find the key factors to succeed in this growing market. In addition to safety, delayed payment and the immediateness for use of mobile phone, we also suggest that a highly developed hardware system is an additional factor under the increased demands for the convenience with various applications.

• Annual Conference on Human and Language Technology
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• 2009.10a
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• pp.40-43
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• 2009

방통융합의 대표적인 서비스인 IPTV의 상용화로 이용자에게는 방송에 대한 다양한 선택의 자유와 편익을 주고 있다. 본 논문에서는 대화시스템을 통해 IPTV 서비스 이용자가 원격 모바일 환경에서 댁내의 IPTV 셋톱장치의 상태를 조회하고 셋톱장치의 환경설정을 변경하거나, IPTV의 채널이나 컨텐츠를 재생할 수 있는 대화시스템의 구조를 제안한다. 이러한 대화시스템을 이용하여 IPTV 사용자는 원격에서 가정내의 자녀들의 TV 시청을 지도하고, 셋톱장치나 리모컨에 익숙하지 않은 유아나 노년층을 위해 원격에서 컨텐츠 재생이 가능하도록 한다. IPTV 영역에 대한 요구 분석을 통해 화행과 의미구조를 수립하였으며, 1만 3천 대화쌍을 수집하였다. 다양한 IPTV 영역에 대응하기 위해 예제기반 추론 방법과 규칙기반 추론 방법을 결합하여 사용할 수 있도록 하였으며, EPG 검색 모듈을 추론모듈에 추가하였다. 또한 SMS 영역에서의 성능향상을 위한 전처리를 도입하였다.