• 산업기술연구
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• 제36권
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• pp.89-92
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• 2016

In this paper, we propose an efficient anonymity algorithm for personal information protections in big data systems. Firstly, we briefly introduce fundamental algorithms of k-anonymity, l-diversity, t-closeness. And then we propose an anonymity algorithm using controlling the size of anonymity groups as well as exchanging the data tuple between anonymity groups. Finally, we demonstrate an example on which proposed algorithm applied. The proposed scheme gave an efficient and simple algorithms for the processing of a big amount of data.

• 한국융합학회논문지
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• 제9권11호
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• pp.75-81
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• 2018

블록체인 내의 모든 트랜잭션이 공개되기 때문에 익명성과 프라이버시 문제는 중요해지고 있다. 공개 블록체인은 사용자 대신 공개키 주소를 사용하여 익명성을 보장하는 것처럼 보이지만 트랜잭션 그래프를 기반으로 다양한 기법을 통해 추적함으로써 익명성을 약화시킬 수 있다. 본 논문에서는 블록체인 환경에서 익명성과 프라이버스를 보호하기 위하여 다양한 보안 기법을 융합하여 사용자의 추적을 어렵게 하는 기법을 제안한다. 제안 기법은 k-anonymity 기술, 믹싱 기술, 은닉서명, 다단계 기법, 램덤 선택기법, 영지식 증명 기법 등을 융합하여 인센티브 및 기여자의 참여를 통해 익명성과 프라이버시를 보호한다. 성능 분석을 통해 제안기법은 기여자의 수가 공모자의 수보다 많은 환경에서는 공모를 통한 프라이버시 및 익명성 훼손이 어렵다는 것을 보였다.

• ETRI Journal
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• 제35권3호
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• pp.501-511
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• 2013

Protecting privacy is an important goal in designing location-based services. Service providers want to verify legitimate users and allow permitted users to enjoy their services. Users, however, want to preserve their privacy and prevent tracking. In this paper, a new framework providing users with more privacy and anonymity in both the authentication process and the querying process is proposed. Unlike the designs proposed in previous works, our framework benefits from a combination of three important techniques: k-anonymity, timed fuzzy logic, and a one-way hash function. Modifying and adapting these existing schemes provides us with a simpler, less complex, yet more mature solution. During authentication, the one-way hash function provides users with more privacy by using fingerprints of users' identities. To provide anonymous authentication, the concept of confidence level is adopted with timed fuzzy logic. Regarding location privacy, spatial k-anonymity prevents the users' locations from being tracked. The experiment results and analysis show that our framework can strengthen the protection of anonymity and privacy of users by incurring a minimal implementation cost and can improve functionality.

• 한국전자거래학회지
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• 제20권1호
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• pp.217-241
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• 2015

온라인 커뮤니티 구성원들의 참여를 독려하고 비행을 막기 위해 어느 수준의 익명성을 보장하여야 하는지에 대한 연구가 시급하다. 그러나, 선행연구들은 익명성의 개념이나 구분에 대한 체계적인 연구를 진행하지 못하였을 뿐만 아니라, 온라인 커뮤니티의 가상 팀 활동에 익명성이 어떠한 영향을 미칠 수 있는지에 대한 연구가 부족하였다. 본 연구에서는 익명성의 개념 및 효과에 대한 선행연구를 종합하고, 익명성을 1) 실명(무익명), 2) 별명(부분 익명), 3) 임의의 숫자 아이디를 임시로 부여(완전 익명)의 세 가지 수준으로 구분하였다. 이러한 익명성의 차이가 온라인 커뮤니티 구성원들의 신뢰 및 인지된 신원 노출 위험에 영향을 미침으로써, 결과적으로 가상 팀 성과에 어떠한 영향을 미치는지를 실증적으로 검증하였다. 실험실 실험이 수행되었으며, 온라인 커뮤니티의 실제 모습을 반영하기 위해 정착된 커뮤니티의 가상 팀 상황을 만들어 자료를 수집하였다. 총 364개의 응답이 수집된 가운데, ANOVA와 PLS를 활용하여 자료를 분석하였다. 연구 결과, 실명과 별명을 부여한 익명성 집단간 차이는 유의하지 않았으며, 임의의 아이디를 임시로 부여하였던 집단만이 인지된 익명성에 유의한 차이를 보였다. 동시에 익명성의 효과는 정착된 커뮤니티의 가상 팀 상황에서는 신뢰, 인지된 위험에 유의한 영향을 미치지 못하는 것으로 조사되었다. 이러한 연구 결과는 온라인 커뮤니티 실무에서 보다 전략적인 커뮤니티 구성원의 익명성 보호 전략을 수립하는데 도움을 줄 수 있을 것으로 판단한다.

• 유통과학연구
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• 제14권8호
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• pp.101-112
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• 2016

Purpose - The objective of this study is to identify the effects of the communication cues and anonymity on group polarization in mobile communication settings, both in terms of route and extent. Research design, data and methodology - Laboratory experiments were conducted to achieve the above research objective; the effect of communication cues on group polarization with social presence as mediation and the direct effect of anonymity, social presence, and perceived cohesion were analyzed. The experiments were conducted by the participation of 240 people, who were divided into 48 groups of 5 people. Results - According to the results, the difference in intergroup polarization due to communication cues and anonymity was insignificant. From this analysis, the structural equation model, communication cues and anonymity did not affect group polarization through social presence. Moreover, anonymity did not affect group polarization through perceived cohesion; however, anonymity directly affected group polarization. Conclusions - This research can help to explain the discussions and the related decision-making actions on internet forums, which have recently come to the rise as well as provide foundational basis in newly establishing policies for the forums.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권8호
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• pp.606-610
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• 2009

위치기반 서비스(Location-Based Service)에서 개인정보 보호를 위해 사용자의 정확한 위치 정보를 숨기는 기법이 요구된다. 이를 위해 본 논분에서는 K-anonymity 및 L-diversity를 고려한 그리드 기반 cloaking 기법을 제안한다. 이 기법은 먼저 사용자가 요구하는 L개의 건물을 탐색하는 L-diversity를 수행한 후, K명의 사용자를 탐색하는 K-anonymity를 수행하여 최소한의 넓이는 가지는 cloaking 영역을 생성한다. 특히 cloaking 영역의 빠른 생성을 위해 효과적인 가지치기 방법을 사용한다. 마지막으로 성능평가를 통해, 본 논문에서 제안하는 cloaking 기법이 cloaking 영역 크기에 따른 질의 처리 시간 측면에서 기존의 연구보다 우수함을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권3호
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• pp.1289-1310
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• 2016

Dynamic ID-based authentication solves the ID-theft problem by changing the ID in each session instead of using a fixed ID while performing authenticated key exchanges between communicating parties. User anonymity is expected to be maintained and the exchanged key kept secret even if one of the long-term keys is compromised in the future. However, in the conventional dynamic ID-based authentication scheme, if the server's long-term key is compromised, user anonymity can be broken or the identities of the users can be traced. In addition, these schemes are vulnerable to replay attacks, in which any adversary who captures the authentication message can retransmit it, and eventually cause the legitimate user to be denied service. This paper proposes a novel dynamic ID-based authentication scheme that preserves forward anonymity as well as forward secrecy and obviates replay attacks.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.680-689
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• 2007

The objective of this paper is to contemplate a possible alternative to the examination, published as a research article in Information Systems Research(Sia et al. 2002), of the effects of communication cues, anonymity, and social presence on group polarization in computer-mediated communication(CMC) settings. Sia et al. introduced the concept of social presence to explain the effects of communication cues and anonymity on group polarization, but we believe that anonymity alone provides a clearer explanation of the results. This paper classifies levels of anonymity to provide possible explanations for Sia et a1. (2002)'s results and presents the results of a new experiment to confirm our explanation. We also want to emphasize that our comments are not intended to disparage the usefulness of social presence as a mediating variable to explain group polarization; our intention instead IS to encourage further investigation to better understand group polarization in CMC settings.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.121-136
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• 2011

With the rapid growth of GPS-enable Smartphones, the interest on using Location Based Services (LBSs) has increased significantly. The evolution in the functionalities provided by those smartphones has enabled them to accurately pinpoint the location of a user. Because location information is what all LBSs depend on to process user's request, it should be properly protected from attackers or malicious service providers (SP). Additionally, maintaining user's privacy and confidentiality are imperative challenges to be overcome. A possible solution for these challenges is to provide user anonymity, which means to ensure that a user initiating a request to the SP should be indistinguishable from a group of people by any adversary who had access to the request. Most of the proposals that maintain user's anonymity are based on location obfuscation. It mainly focuses on adjusting the resolution of the user's location information. In this paper, we present a new protocol that is focused on using cryptographic techniques to provide anonymity for LBSs users in the smartphone environment. This protocol makes use of a trusted third party called the Anonymity Server (AS) that ensures anonymous communication between the user and the service provider.

• 유통과학연구
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• 제13권2호
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• pp.75-83
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• 2015

Purpose - This study aims to identify the effects of communication cues, anonymity, and social presence on group polarization in computer-mediated communication (CMC) settings. Extant literature has introduced some theoretical backgrounds of social presence and SIDE (Social Identity model of Deindividuation Effects) to explain the effects of communication cues and anonymity. The concept of social presence emphasized the mediating role on communication cues and anonymity. However, most literature did not measure social presence and compare group polarization of all condition groups. This does not sufficiently explain the result of group polarization. Research design, data, and methodology - We believe that the direct impact of anonymity on group polarization can provide a more admissible and clearer explanation for the results. In addition, this study categorizes anonymity into two levels, as anonymity of group and anonymity of self. To justify the anonymity view, a laboratory experiment was conducted. The experiment was conducted in communication cues settings (visual cue; without visual cue) and anonymity settings (identified; anonymous). Each of the four settings has 10 groups consisting of five subjects each (total 200 subjects). The subjects are undergraduates from a large university, majoring in business. All experimental procedures and calculations of choice shift and preference change follow the literature. Results - First, the removal of visual cues does not produce a significant impact on group polarization, which cannot be explained by the social presence view. Second, the anonymous condition does not significantly affect group polarization, which also cannot be explained by the social presence view. However, the anonymous condition directly affects group polarization. Specifically, anonymity of self has a stronger effect on group polarization than anonymity of group. The result explains about the leading factor affecting group polarization. This study examines another view of how computer-mediated communication may be associated with group polarization. The process and outcome data from the experiment reveal that group polarization is not affected by level of social presence, but by level of anonymity. Group discussions conducted with visual cue CMC setting and identified CMC setting result in weaker group polarization. Conversely, group discussions conducted without visual cue CMC setting and anonymous CMC setting lead to stronger group polarization. The results of the study have the following implications. First, they provide clues for business organizations to design the most appropriate media conditions and preemptive social conditions to implement when making group decisions through CMC, to maximize achievements, generate amicable agreements, or actively share information. Second, this study can be useful in analyzing different adverse effects generated through Internet use. Conclusions - This research can help explain discussions and decision-making actions on Internet forums, which have recently increased, as well as providing a foundational basis in newly establishing policies for the forums. Finally, it should be noted that many other factors such as group size, topics, and group history may affect group polarization. These should be examined in future studies.