• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.67-70
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• 2013

스마트폰 보급은 현대인들에게 시간적, 공간적 제약에서 벗어나 언제 어디서나 무선 인터넷을 사용하여 모바일 뱅킹, 결재, 증권거래 등 원하는 서비스를 이용할 수 있게 해주었다. 사용자들은 이를 이용하여 다양한 정보들을 검색, 저장, 이용한다. 그러나 무선 인터넷의 순기능과는 반대로 최근 모바일 기기의 보안취약점을 이용한 악성애플리케이션 및 각종 공격으로 사용자 개인정보탈취의 위협이 증가하고 있다. 사회공학공격의 일종인 피싱(Phishing)은 신뢰받는 기관을 사칭하여 만들어놓은 가짜사이트에 사용자로부터 자신의 개인정보 및 금융정보를 입력하게끔 유도하여 사용자정보를 탈취하는 방법으로 최근 SMS를 이용하여 정부 및 금융기관을 사칭한 문자를 보내 피싱사이트로 접속을 유도하는 피해사례가 증가하고 있다. 본 논문에서는 국내 피싱사이트의 유형을 분석하고 피싱사이트로 접근을 유도하는 방법 중 하나인 SMS를 이용한 피싱을 방지 할 수 있는 시스템을 고안한다.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.513-516
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• 2001

This study was to develop of efficient microbial agent for malodor removal. Total ten strains of beneficial bacteria Bacillus sp., Pseudomonas sp., and photosynthetic bacteria were isolated and identified on the basis of their morphological and biochemical characteristics. The enzyme activities such as amylase, protease, lipase and cellulase of bacteria cells were measured. Furthennore, effective formulation procedure 、 ,vas developed with nutrient additive, stabilizing agent and mineral materix. For preparation of microbial agent, developing of formulation technique was very helpful for incresing the cell survival rate.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.1225-1229
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• 2013

In this paper, we studied threats and risks that users might enter their passwords without awareness onto phishing and pharming sites, and particularly showed that it was highly likely to leak the secret information of multiple passwords by user experiments. The novel methodology of verifying those threats and risks is the major contribution of this paper. We will extend this work for further verification of our findings.

• Polymer(Korea)
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• v.30 no.5
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• pp.397-401
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• 2006

In this study, we coated the polypropylene filter with titania sol and investigated various characteristic such as its deodorization efficiency and sterilization effect of gram negative bacillus Escherichia coli(ATCC 25922) and gram positive bacillus Staphylococcus aureus(ATCC 6538). As the results, in case of titania sol coated polypropylene filter, the deodorization rate of ammonia, trimethylamin and acetic acid which cause indoor air pollution was 66%, 90% and 16% respectively. Also. the sterilization rate of gram negative bacillus Escherichia coli(ATCC 25922) and gram positive bacillus Staphylococcus aureus(ATCC 6538) was 99.9% after 24 hours.

• Elastomers and Composites
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• v.49 no.4
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• pp.336-340
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• 2014

The functionality such as deodorant, antibacterial, ultraviolet shielding of titanium dioxide self-actuated photocatalyst $Weltouch^{TM}$ treated polyester fiber was characterized in conditions without light. The deodorizing capacity was maintained more than 97% reduction irrespective of before washing and after 20 times repeated washing, and antimicrobial capacity was also retained more than 99.9% reduction. Titanium dioxide self-actuated photocatalyst was still maintained to the surface of polyester fiber without separation even after 20 times repeated washing. According to washing durability of polyester fiber, the reduction effect for ammonia was still retained even after 20 times repeated washing as much as before washing. The ultraviolet shielding capacity was still maintained at least 83% irrespective of before washing and 20 times repeated washing.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.1
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• pp.165-174
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• 2019

They are frequently used today in public places such as street, subway, school or library. Since users can sometimes print documents that contain confidential data using Printer Kiosks, the devices should store and manage the documents securely. In this paper, we identify potential security threats in Printer Kiosks and suggest practical attack scenarios that can take place. To show the feasibility of suggested attack, we analyzed network traffic that were generated by the real Printer Kiosk device. As a result of our analysis, we have found that attackers can access other users' scanned files and access other users' documents from Printer Kiosk's home page. We confirmed that using our attack, we could retrieve other users' personal data.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.4
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• pp.187-194
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• 2008

This paper proposes an effective countermeasure to an intrinsic hardware vulnerability of the keyboard controller that causes sniffing problem on the password authentication system based on the keyboard input string. Through the vulnerability, some possible attacker is able to snoop whole the password string input from the keyboard even when any of the existing keyboard protection software is running. However, it will be impossible for attackers to gather the exact password strings if the proposed policy is applied to the authentication system though they can sniff the keyboard hardware protocol. It is expected that people can use secure Internet commerce after implementing and applying the proposed policy to the real environment.

• Convergence Security Journal
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• v.22 no.4
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• pp.141-146
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• 2022

The iris, a biometric information, is safe, unique, and reliable, such as fingerprints, and is personal information that can significantly lower the misrecognition rate than other biometric authentication. However, due to the nature of biometric authentication, it is impossible to replace it if it is stolen. There is a case in which an actual iris photo is taken and 3d printed so that the eyes work as if they were in front of the camera. As such, there is a possibility of iris leakage through high-definition images and photos. In this paper, we propose to improve iris masking performance by supplementing iris region masking research based on existing blurring techniques. Based on the results derived in this study, it is expected that it can be used for the security of video conference programs and electronic devices.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.208-209
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• 2023

IT(Information Technology) 기술이 고도화됨에 따라 금융 분야에서는 스마트 컨트랙트에 기반하여 자산을 거래할 수 있는 DeFi(Decentralized Finance)가 발전하고 있다. 또한, 다양한 IoT(Internet of Things) 기기들로 구성된 융합환경이 상호 연결되며 IoBE(Internet of Blended Environment)가 조성되고 있다. IoBE의 구성요소 중 의료융합환경인 디지털 헬스케어는 스마트 의료 기기를 통해 진료서비스를 제공한다. 최근에는 디지털 헬스케어 내 자산 거래 수단으로 DeFi를 활용하기 위한 연구가 진행되고 있다. 그러나, 디지털 헬스케어 서비스에 DeFi가 활용될 수 있음에 따라 DeFi 내 보안 위협이 전파될 수 있다. 전파된 보안 위협은 DeFi에서의 디지털 화폐 탈취뿐만 아니라, 디지털 헬스케어 내민감 정보 탈취, 서비스 거부 공격 등 복합 위협으로 이어질 수 있다. 따라서, 본 논문에서는 DeFi의 취약점을 분석하고 이를 기반으로 디지털 헬스케어에서 발생 가능한 공격 시나리오를 도출한다.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.1
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• pp.43-52
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• 2000

Deodorization characteristics and removal rate of sulfur-containing odor have been investigated in the soil filter reactors packed with montmorillonites (Mont.), rice hulls(Rh.), and thickening-activated sludge(Ts.). And variation of pH and $SO_4{^{2-}}$ with the removal of malodorous sulfur compounds have been investigated together. As compared removal rate of montmorillonites between wet and dry condition for sulfur compounds through batch test, it showed that wet condition was better than dry one; removal ratio, as wet/dry, was $H_2S$ of 1.2 and $CH_3SH$ of 1.9, and decrease of pH and increase of $SO_4{^{2-}}$ concentration in the wet condition also showed to be larger than in dry condition. In continuous test for biological deodorization experiment, removal rate of sulfur compounds in reactor packed with Mont., Rh. and Ts, was more than 98 %, and the variation of static pressure was maintained stably under condition of SV $150h^{-1}$, LV 4.2 mm/sec and SV $200h^{-1}$, LV 5.6 mm/sec, and in reactor packed with Mont. and Rh., $H_2S$ was 76.4 % to 87.2 % and $CH_3SH$ was 87.8 % to 93.3 % under the same condition. From above results, it ascertained that it can obtain the high deodorization efficiency by inoculating thickening-activated sludge in soil filter using montmorillonites.