• Journal of the Korea Convergence Society
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• v.2 no.4
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• pp.9-14
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• 2011

Phishing is an attack to theft an user's identity by masquerading the user or the device. The number of phishing victims are sharply increased due to wide spread use of smart phones and messenger programs. Smart phones can operate various wi-fi based apps besides typical voice call and SMS functions. Generally, the messenger program such as Kakao Talk or Nate On is consisted of client and server functions. Thus, the authentication between the client and the server is essential to communicate securely. In this paper, we propose the messenger authentication protocol safe against smart phone phishing. To protect communications among clients, the proposed method provides message encryption and authentication functions.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.1
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• pp.97-107
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• 2013

The recent increase in smartphone usage has ignited the development of new applications which have changed the way of living in this internet era in the world. Almost all users which have smartphone have used many kinds of applications for lots of part. Especially, Social Network Service is the most popular part for smartphone users. The greater part of smartphone users take messenger service for smartphone. This kinds of applications provide to manage as deactivation of user or change of device. When users take to manage their information, their information would be deleted securely. If secure deletion didn't work correctly and released, their personal information can be easily abused to by others through various means such as internet phishing. In this paper, we analysis that the messenger application's management function keeps on the Personal Information Protection Act and suggest to prevent legally and technically for user's personal information and privacy.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.1
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• pp.61-71
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• 2021

Instant messengers are a means of communication for modern people and can be used with smartphones and PCs respectively or connected with each other. Messengers, which provide various functions such as message, call, and file sharing, contain user behavior information regarded as important evidence in forensic investigation. However, it is difficult to analyze as well as acquire smartphone data because of the security of smartphones or apps. However, messenger data can be extracted through PC when the messenger is used on PC. In this paper, we obtained the credential data of Wire messenger in Windows 10, and showed that it is possible to log-in from another PC without authentication. In addition, we identified and classified major artifacts generated based on user behavior.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1032-1034
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• 2010

최근 스마트폰의 수요가 급증하면서, 사용자들의 편의를 위한 애플리케이션의 필요성도 함께 증가하고 있다. 또한 무선 랜(wi-fi)이 제공되는 지역도 점점 늘어나는 추세이다. 이러한 흐름의 일환으로, 우리는 어디서든 사용이 가능하며, 우리가 속한 대학에 특화된 스마트폰용 메신저를 개발하였다. 스마트폰의 무선 랜(Wi-fi)기능을 이용하여 문자, 음성, 파일 전송 등 이동성을 살린 메신저는 학생들과 교직원들이 편리하게 사용 할 수 있어 학교에서 일어나는 활동에 적합화되어 있다.

• Informatization Policy
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• v.25 no.4
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• pp.65-83
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• 2018

This study examined the effects of smartphone usage types and excessive expectation for smartphone on adolescents' smartphone overdependence. It utilized the data of 3,454 adolescents (1,758 males and 1,696 females), aged between 13 and 19 from a smartphone overdependence survey of the National Information Society Agency. As a result of the hierarchical multiple regression analysis, age and household income had a negative effect on smartphone overdependence. Weekly smartphone usage time positively affected the serious consequences (sub-factor of smartphone overdependence). Among the different types of smartphone usage, information seeking, SNS, gaming, and the excessive expectation for smartphones had positive impact on smartphone overdependence. Smartphone usage for leisure seeking did not affect smartphone overdependence, but it negatively influenced serious consequences. Messenger use did not affect smartphone overdependence, but the use had a positive effect on salience, and a negative effect on serious consequences. The results of this study suggest that it is necessary to identify the types of smartphone use as well as the usage time to understand the smartphone dependence of adolescents. In addition, it seems necessary to recognize and correct the irrational excessive expectation for smartphone in order to prevent dependence and implement effective interventions.

• Convergence Security Journal
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• v.18 no.2
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• pp.25-32
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• 2018

As the use of smartphones become more common, the communication via instant messenger becomes natural. However, it is important to secure the relevant information promptly since the chat room between participants can be used as a space for a criminal conspiracy, and crime-related contents can be stored and deleted easily on smartphones. Therefore, this study aims to identify the available data and to use it as proof by comparing and analyzing the instant messengers with high usage rate.

• Journal of Digital Contents Society
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• v.13 no.3
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• pp.401-412
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• 2012

Communication through smartphones is creating a new paradigm of mobile communication beyond the restrictions of mobility and space. The mobile instant messengers of the smartphone, which began on the desktop environment, are providing various communication features, including multimedia contents, texts, and voice. Kindergartens and nurseries are using Websites, phones, SMS, printed materials, handwritten notifications, etc. to communicate with the parents. IsPlus was developed to facilitate the communication between the parents and the teachers, including exchanges of pictures and videos, chatting, and attendance management using smartphones. This is meaningful in that it is an early smartphone mobile messenger for educational institutions for infants and preschoolers. This study presented a new approach to the development of a mobile messenger for a specific group of users by analyzing the user environment, communication types, application planning process and interface design development using storytelling.

• Journal of Convergence for Information Technology
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• v.9 no.11
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• pp.22-27
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• 2019

Along with the universalization of smartphones, smartphone addiction is becoming a physical and mental social problem. The purpose of this study was to investigate the relevance of the problems caused by addiction in 300 adolescents, adults and the elderly. The results showed that the use of SNS and messenger were most related to the negative factors such as health problems, depression, antisocial, schizophrenia, lower self-esteem, and lower social expectation. In addition, games and videos were analyzed to have relatively low negative problems. Focusing on the high addiction rate, the researcher further analyzed the preference for problem solution and discussed the improvement measures for smartphone addiction reduction.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.225-226
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• 2016

본 논문에서는 기존의 메신저 서비스들을 비교하고 분석한다. 그 결과를 토대로 대화내용을 사용자의 스마트폰에 저장하여 외부유출을 방지하고 프로토콜 내에서 제공해주는 암호화 방식을 통해 메시지를 송 수신하여 보안을 강화한 1:1채팅용 모바일 메신저 어플리케이션을 설계 및 구현 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1533-1535
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• 2010

사용자의 감정을 자동으로 인식하고 3D 캐릭터 애니메이션을 통해 표현한다면 기기를 통한 통신에 더 풍부한 감성을 부여하여 의사 소통의 효과를 높일 수 있다. 본 논문에서는 IPTV와 스마트폰 기기에서 구동되는 감성 메신저의 개발에 대해 기술한다. 이를 위해 문장 및 음색 분석을 통한 감정 인식, 영상 속의 얼굴 표정 추적, 그리고 개인화된 3D 캐릭터의 표정 및 몸동작 애니메이션을 통해 감정을 전달하는 감성 메신저를 제안하고 그 효과를 서술한다. Naive Bayes 알고리즘을 이용한 채팅 문장에서의 자동 감성 인식이 개발되었으며 실험을 통해 성능 및 효과를 검증한다.