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Choi, Jusop,Yu, Jaegwan,Hyun, Sangwon,Kim, Hyoungshick Elsevier 2019 Digital investigation Vol.28 No.suppl
<P><B>Abstract</B></P> <P>Instant messaging applications store users' personal data (e.g., user profile, chat messages, photos and video clips). Because those data typically include privacy sensitive information, most instant messaging applications are trying to protect the stored data in an encrypted form so that the authorized messaging application itself can only access the data. In this paper, we analyzed the locations and file formats of personal data files in three instant messaging applications (KakaoTalk, NateOn, and QQ) which are the most popularly used in China and South Korea. We particularly examined the encryption and decryption procedures for internal databases in those messaging applications through reverse-engineering. Our analysis results demonstrate how the database files of those instant messaging applications are stored and encrypted. Moreover, in the cases of KakaoTalk and NateOn applications, we found that their encrypted database files can successfully be recovered without requiring user password. We also found that QQ messenger stores the encryption key for the database files into an external server. This implementation may raise another privacy concern because users’ personal data can be freely accessed by the service provider without user consent.</P>
조금환(Geumhwan Cho),최주섭(Jusop Choi),김형식(Hyoungshick Kim) 한국정보보호학회 2017 情報保護學會誌 Vol.27 No.1
웹 사이트에서 자동화 공격 도구를 이용한 다양한 종류의 공격을 방지하기 위한 보안 솔루션으로 CAPTCHA가 널리 이용되고 있다. 그러나 동시에 CAPTCHA를 해결하는 자동화 도구에 대한 연구가 진행되면서 CAPTCHA에 사용되는 텍스트 이미지(예: 숫자, 글자)를 더욱 어렵게 만들게 되었다. 그 결과 사용자도 CAPTCHA를 해결하는데 어려움을 겪게 되었고, 결론적으로 보안성을 높이기 위해 사용성을 감소시킨 결과를 초래 하였다. 본 논문에서는 텍스트, 오디오 및 이미지 기반 CAPTCHA로 분류하여 보안성과 사용성 측면에서 분석하고자 한다.
Yasin, Siti Munira,Ismail, Nurhuda,Noor, Norizal Mohd,Azman, Mohd Shafiq Mohd,Taib, Hanisah,Jusop, Junainah Mat,Salaudin, Nur Atirah Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Medical students' views may provide some direction for future policy considerations. Aim: The aim of this study was to assess gender differences in future doctors' receptiveness to currently implemented anti-smoking messages and the effectiveness of those messages. Materials and Methods: We administered a questionnaire to all students at a medical university in Malaysia, asking how frequently they noted anti-smoking policies, anti-smoking campaigns, and anti-smoking messages in schools. In addition, the questionnaire investigated most effective methods to convey these messages. Results: A total of 522 (59.7%) students responded. Students were least likely to approve of total bans on cigarettes and increasing the price of cigarettes, and most likely to approve of bans on use of cigarettes in public places and sales to individuals less than 16 years old. Approval of total bans on cigarettes was more common in female students than in males OR=0.39 (95%CI: 0.18-0.86). Furthermore, compared to the female students, the male students thought that printed media; OR=2.32 (95%CI: 1.31-4.10), radio; OR=1.93 (95%CI: 1.15-3.22) and the internet; OR=1.96 (95%CI: 1.15-3.33) were very effective at delivering anti-smoking messages. Conclusions: Gender differences existed in the future doctors' perception of the effectiveness of anti-smoking initiatives. Taking this gender difference into account may increase the receipt of anti-smoking messages in adolescents.