• Journal of the Korea Institute of Information Security & Cryptology
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• v.33 no.1
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• pp.45-50
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• 2023

Roblox, the world's No. 1 metaverse platform, has more than 3 billion subscription accounts and more than 150 millionmonthly active users (MAU). Despite such high interest in metaverse, existing studies on analyzing the risk of cyberattacks and security in the metaverse environment is insufficient. Therefore, in this paper, we propose a new steganography-basedcovert communication method in Roblox. In our proposed method, a secret message is hidden into an image by using a function provided in the Roblox Experience environment and then the image is automatically stored in the RobloxExperience participants' devices (PC or Smartphone) so that a malicious software can extract the hidden message fromthe image. By our experiments in the Roblox metaverse environment, we validated our proposed method works and thus want to inform our proposed method can be used in various cyberattacks and crimes such as the spread of secret commands, the establishment of a steganography botnet, and the mass distribution of malicious malware in metaverse platforms.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.07a
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• pp.21-25
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• 2003

Key exposure is the most devastating attacks in any crytographic scheme. In this paper, we investigate key exposure problem in blind signature. We then present a variant of Okamoto-Guillou-Quisquater (OGQ for short) blind signature scheme guaranteeing forward secrecy. Namely, even if current secret key is revealed, forging any signature valid in the past is impossible. Our proposed scheme exhibits an efficient key updating protocol and introduces no significant communication overhead.

• International journal of advanced smart convergence
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• v.8 no.1
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• pp.214-221
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• 2019

This study attempted to extend Korean Wave literature by investigating (a) the influence of protagonists' personality characteristics and the role of empathy under the affective disposition theory, and (b) the power of some external factors in the entertainment media selection. After watching an episode of the popular Korean drama, Secret Garden, participants completed a survey in the United States. Results demonstrated that (a) the effect of personality characteristics varied across gender and (b) external factors affects the entertainment media selection positively. Findings indicate that media enjoyment is dependent on the audience's external factors.

• Asian Oncology Nursing
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• v.11 no.3
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• pp.200-209
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• 2011

Purpose: The purpose of this micro-ethnography is to examine whether science and societal changes impact family communication patterns among a convenience sample of 16 Korean women. Methods: The authors observed family communication in the context of a new breast cancer genetic screening and diagnostic testing program to detect BRCA gene mutations in Korean women at highest risk. Results: Analysis of in-depth interviews and field notes taken during participant observation illustrated that communication patterns in families vary according to a woman's position in the family. If a grandmother tests positive for a gene mutation, her daughters make decisions on her behalf; they open and maintain the communication channel among family members. If a housewife is diagnosed with cancer and a genetic mutation, she immediately consults her husband and her sisters. The husband creates an open communication channel between his wife, his parents and his siblings. As a result, a woman's cancer is a concern for the whole family not merely a woman's secret or crisis. Conclusion: Cultural differences are important to consider when designing new genetic service programs in different countries.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.815-818
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• 2000

As the growth of internet and the diffusion of wide multimedia applications are increased, the ownership verification and authentication in communication channel for a digital image become more important. For these purpose there are many watermarking scheme available for image, video stream and audio data. In this paper we studied on techniques for integrity and authentication of digital images and proposed new watermarking algorithm. The proposed algorithm is implemented in C language on IBM-PC and the test results are shown.

• Convergence Security Journal
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• v.2 no.1
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• pp.59-68
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• 2002

The smart card including memory and processor is able to simple process such as privilege unauthorized access and used to Authentication System for security. In this paper, we propose using the smart card in the key exchange phase when secure Internet phones conversation, so certainly guarantee to mutual authentication and secret communication.

• Convergence Security Journal
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• v.3 no.1
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• pp.31-37
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• 2003

This paper proposed a model supporting secure mechanism both group communication service and subgroup communication service of TETRA system that the standard developed by the technical committee Radio Equipment and Systems(RES) of the European Telecommunications Standards Institute(ETSI) provides a pure digital information technology for the transmission of speech and data. In each scheme, members in a subgroup maintains its subgroup key, which is not distributed, but computed by each member in the subgroup only with his own secret information and public values and secure subgroup members in a same subgroup can communication securely each other by using their subgroup key. Also, all members in group can share securely a group key. In communication services of TETRA system, this model supports mechanism for both group and subgroup communication are simultaneously needed.

• The Transactions of the Korea Information Processing Society
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• v.4 no.12
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• pp.3078-3087
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• 1997

The information security is very important in computer communication network, and the security system has been developed in many aspects to provide secure communication. The secret key distribution and mutual user authentication are essential element in designing security system, then many algorithms and implementation schemes have been proposed. But they don't consider communication protocol, so they are not easy to adapt a real communication network' In this paper, we propose a key distriburion and mutual user authentication scheme based on X.25 protocol which is the most popular in packet communication, and the proposed scheme maintains a protocol transparency and can select communication mode, so the security system is more capable.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.2
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• pp.411-420
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• 1999

The topic of electronic commerce is a hot issue in computer technology. There are many kinds of risks associated with electronic commerce which performs financial transactions by exchanging electronic information over public networks. Therefore, security factors such as confidentiality, integrity, authentication and non-repudiation should be required to construct secure electronic commerce systems. In this paper, the credit card-based payment protocol applying dual signature is presented. It provides payment information to the bank a cardholder pays to, but conceals ordering information. It also offers ordering information to a merchant, but hides payment information including the card number. Thus, cardholder's private information can be protected. In order to accomplish this, dual signature is performed employing both symmetric method utilizing cardholder's secret number as an encryption key and asymmetric method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.1
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• pp.221-237
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• 2016

The wireless body area networks (WBANs) consist of wearable computing devices and can support various healthcare-related applications. There exist two crucial issues when WBANs are utilized for healthcare applications. One is the protection of the sensitive biometric data transmitted over the insecure wireless channels. The other is the design of effective medical management mechanisms. In this paper, a secure medical information management system is proposed and implemented on a TinyOS-based WBAN test bed to simultaneously address these two issues. In this system, the electronic medical record (EMR) is bound to the biometric data with a novel fragile zero-watermarking scheme based on the modified visual secret sharing (MVSS). In this manner, the EMR can be utilized not only for medical management but also for data integrity checking. Additionally, both the biometric data and the EMR are encrypted, and the EMR is further protected by the MVSS. Our analysis and experimental results demonstrate that the proposed system not only protects the confidentialities of both the biometric data and the EMR but also offers reliable patient information authentication, explicit healthcare operation verification and undeniable doctor liability identification for WBANs.