• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.116-120
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• 2007

KOSEN(KOrean Scientists and Engineers' Network) started Blog servece to encourage users' knowledge sharing and interaction between users. Since blog opened in April of 2007, 251 blogs have been made. We could collect diverse information from technical knowledge to private hobbies. We could find our blog's limitations and weakness, too. We analyze blog patterns and suggest strategies for service activation in this paper.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.642-645
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• 2012

MANET has disadvantage for information intrusion caused from non-infra structure. That is based on mixed problems caused from terminal devices has no capability of various resources using abilities to run intrusion prevention function, and also from difficulty of no easy using infra structural server like as firewall. In this paper, transmission performances, be effected from information intrusion and IDS(Intrusion Detection System), are analyzed for large scale MANET, and weakness from information intrusion of MANET are studied. This study is for large scale MANET which has some large communication area and lots of nodes, voice traffic, based on VoIP protocols, is considered as application services be transmitted over MANETs. Computer simulation using NS-2 is used to measure and show MOS and call connection ratios.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.4B
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• pp.592-598
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• 2010

A home network system is made up of subject of cyber attack from a variety factors of threatening, but also have security weakness in cases of hacking, vicious code, worm virus, DoS attack, tapping of communication network, and more. So, the necessity for a security protocol to protect user asset and personal information within a home network is gradually increasing. Thus, this paper designs and suggests a home network security protocol using user authentication and approach-control technology to prevent the threat by unauthorized users towards personal information and user asset in advance by providing the gradual authority to corresponding devices based on authorized information, after authorizing the users with a Public Key Certificate.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.10
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• pp.5144-5160
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• 2019

Secret sharing is an effective way of protecting secret messages. However, the traditional secret sharing schemes are considered meaningless due to malicious people attention which might raise risks. To overcome the weakness, this paper presents an effective secret sharing scheme with the functionality of cheater identification, based on meaningful QR code. The secret message will be split and concealed in the padding region of cover QR codes with the assistance of Latin square and it can be completely restored when all the involved participants cooperate. The concealing strategy exploits the characteristic of Reed-Solomon (RS) code to ensure the strong robustness of generated QR code pseudo-shares. The meaningful QR code pseudo-shares help to reduce the curious of unrelated persons. Some experiments were done to evaluate the performance of proposed scheme. The results showed that the proposed scheme is feasible, efficient and secure compared to the other existing schemes. It also achieves a higher secret payload and maintains stronger robustness.

• Journal of the Korean Data and Information Science Society
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• v.21 no.2
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• pp.271-277
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• 2010

The randomized response technique is an indirect question that employs a randomizing device to protect respondents' privacy. The technique is now considered the most efficient of the newly developed techniques. In this technique, Chang et al. (2004) suggests an improved forced-answer technique and finds more efficient conditions than Warner did in 1965. But it is the weakness of the technique to lose more information than a direct response technique does. Therefore, a lot of researches have developed new techniques to reduce loss of information, to enhance estimated efficiency, and to efficiently use collected information. Considering this tendency, this paper also tries to improve Chang's technique. It suggests the technique that is extended from Chang's and finds more efficient conditions than Chang's technique and Mangat and Singh's (1990) did.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.280-282
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• 2016

오늘날 IoT 사물기기들의 사용 범위가 늘어나면서 해커들은 IoT 기기에서 네트워크상의 서비스 및 정보검색의 기능을 하는 프로토콜인 SSDP의 취약점을 악용하여 SSDP DRDoS(분산 반사 서비스 거부) 공격이라는 새로운 형태의 공격을 만들어 공격을 시도하고 있다. 이는 단순히 우리 생활에서 쓰이는 IoT 기기의 위협뿐만 아니라 사람의 생명이나 주요 기반시설 등에서 사용되어지는 IoT기기들의 공격으로 이어지면 큰 위험을 나타낼 수 있다. 앞으로 IoT기기들이 점차 증가되어 생활에 편리함과 실용성을 가지고 오는 반면에 해커들은 더욱더 교묘하고 복잡하게 공격을 시도를 할 것이다. 특히 본 논문에서는 DRDoS의 몇 가지 공격방법을 알아보고 그중에 IoT 기기에서 사용되어지는 SSDP프로토콜의 관련연구 및 공격방법들을 알아보고 공격시나리오 및 대응방안을 제안한다.

• Journal of the Korea Institute of Military Science and Technology
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• v.18 no.4
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• pp.432-440
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• 2015

UGVs(Unmanned Ground Vehicles) are robots that can substitute humans in reconnaissance operations of potentially dangerous and contaminated sites. Currently, there have been active research on utilizing UGVs in military environments. Much resrach has been focused on exploiting the weakness of topology-based routing and instead utilize location-based routing for the networking of UGVs. It is generally assumed that location-based routing methods can fully utilize the location information gained from GPS. However, this may not be possible in tactical environments due to enemy GPS jamming and LOS(Line of Sight) limitations. To solve this problem, we propose a location-based routing scheme utilizing low control message that can calibrate the location information using GPS information as well as location of neighboring UGV, movement direct and speed information. Also utilizing topology-based routing scheme to solve incorrect location information in GPS jamming region.

• Journal of Information Processing Systems
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• v.13 no.5
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• pp.1382-1396
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• 2017

In this paper, we analyze a recently proposed semi-fragile watermarking scheme based on local binary pattern (LBP) operators, and note that it has a fundamental flaw in the design. In this work, a binary watermark is embedded into image blocks by modifying the neighborhood pixels according to the LBP pattern. However, different image blocks might have the same LBP pattern, which can lead to false detection in watermark extraction process. In other words, one can modify the host image intentionally without affecting its watermark message. In addition, there is no encryption process before watermark embedding, which brings another potential security problem. To illustrate its weakness, two special copy-paste attacks are proposed in this paper, and several experiments are conducted to prove the effectiveness of these attacks. To solve these problems, an improved semi-fragile watermarking based on LBP operators is presented. In watermark embedding process, the central pixel value of each block is taken into account and Arnold transform is adopted to guarantee the security of watermark. Experimental results show that the improved watermarking scheme can overcome the above defects and locate the tampered region effectively.

• Journal of the Korea Society of Computer and Information
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• v.20 no.8
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• pp.7-13
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• 2015

Recently, there are serviced user customized advertisement of various type using smart device. Representative services are advertisement service using light of smart TV screen or audible sound of smart TV to transmit advertisement information. However, those services have to do a specific action of smart device user for advertisement information or need audible audio information of TV contents. To overcome those weakness, therefore, we propose an advertisement method using inaudible sound of speaker based on smart device. This method supports the transfer of advertising content to the smart device user with no additional action or TV audio signal required to access that content. The proposed method used two high frequencies among 18kHz ~ 22kHz of audible frequency range which smart TV can send out. And it generates those frequencies synthesized with audio of TV contents as trigger signal which can send advertisements to smart device. Next, smart device analysis the trigger signal and request advertisement contents related to the signal to server. After then, smart device can show the downloaded contents to user. Because the proposed method uses the high frequencies of sound signals via the inner speaker of the smart device, its main advantage is that it does not affect the audio signal of TV content. To evaluate the efficacy of the proposed method, we developed an application to implement it and subsequently carried out an advertisement transmission experiment. The success rate of the transmission experiment was approximately 97%. Based on this result, we believe the proposed method will be a useful technique in introducing a customized user advertising service.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.5
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• pp.105-117
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• 2001

As we live in the 21st century, so called the "Information Age", network has become a basic establishment. However, we have found the different face that it also has been used as a tool of a unauthorized outflow and destruction of information. In recent years, beginner could easily get a hacking and weakness reference tools from internet. The menace of the situation has increased; the intellectual diverse offensive technique has become increasingly dangerous. The purpose of the thesis is to detect a abnormal packet for networking offense. In order to detect the packet, it gathers the packets and create inspection information that tells abnormality by using probability of special quality, then decision of intrusion is made by using a neural network.l network.