• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.199-201
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• 2012

스마트폰은 사용자들에게 편리함을 제공하지만 분실과 악성코로 인한 보안적인 측면에서 문제점을 이슈가 되고 있다. 본 논문에서는 이중 보안 시스템 환경을 이용하여 기존에 사용되어지고 있는 스마트폰 뱅킹 환경에서의 문제점을 해결하고자 한다. 분실 또는 악성코드를 통해 개인정보 유출, 금전적인 피해를 줄이기 위해서는 스마트폰 뱅킹 서비스 환경에서 개인정보의 통제 및 보호가 보장되는 개인인증 방법을 제공할 필요가 있다. 이를 위해서 기존 방식과 더불어 스마트폰의 자이로센서를 이용한 모션 패스워드 인증방식을 제안한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.6
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• pp.163-167
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• 2006

Multi-level ${\mu}TESLA$ is an efficient extension to ${\mu}TESLA$ to provide an extended lifetime for long-lived sensor networks. This paper presents new constructions of multi-level ${\mu}TESLA$ with immediate authentication of key chain commitments. The proposed constructions are shown to be more efficient and robust than the previous multi-level ${\mu}TESLA$ extension.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.249-252
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• 2003

This paper propose an advanced circuit for fingerprint sensor signal processing. We increased the voltage between ridge and valley by modifying the parasitic capacitance eliminating circuit of sensor plate. The analog to comparator was designed for comparing the sensor signal voltage with the reference signal voltage. We also propose an exective isolation strategy for removing noise and signal coupling of each sensor pixel. The 128$\times$144 pixel fingerprint sensor circuit was designed and simulated, and the layout was performed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.1191-1197
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• 2013

In large-scale distributed sensor networks, it is often recommended to employ mobile sinks, instead of fixed base stations, for data collection to prolong network lifetime and enhance security. Mobile sinks may also be used, e.g., for network repair, identification and isolation of compromised sensor nodes and localized reprogramming, etc. In such circumstances, mobile sinks should be able to securely interact with neighbor sensor nodes while traversing the network. This paper presents a secure and efficient mobile query protocol that can be used for such purposes.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.295-296
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• 2018

본 논문은 입 출차를 하는 주차타워의 원리를 바탕으로 NFC를 활용하여 신발을 반 출입하고, IoT 센서를 이용하여 신발의 관리를 편리하게 도와주는 자동 신발타워이다. 수동으로 번호를 입력하던 주차타워와는 다르게 제안한 신발타워는 NFC에 있는 고유ID값을 활용하여 인증된 사용자가 신발장의 센서 터치로 본인의 신발을 반 출입하도록 한다. 신발장 관리 시스템은 신발의 임의적인 반출을 가능하게 하며, IoT센서를 탑재하여 신발장 내부에 향균, 건조, 온도 조절 등의 효과를 탑재하여 신발의 관리를 편리하게 도와주는 기능들을 제공한다.

• The KIPS Transactions:PartC
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• v.14C no.5
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• pp.389-394
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• 2007

Recently, a location-based threshold-endorsement(LTE) scheme is proposed to thwart bogus data injection attacks. The scheme exhibits much greater filtering power than earlier symmetric schemes and results in enhanced energy savings. In this paper, we show that LTE has fatal vulnerabilities. We also propose an improved scheme that mitigates the weakness and thereby achieves the original claims without lessening remarkable filtering power intended in LTE.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.467-470
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• 2012

This paper proposes a technique of sybil attack detection using an ID-based certificate on sensor network. First, it can solve the broadcast storm problem happening when keys are distributed to sensor nodes. Second, it prevents the replay attack by periodically generating and changing the keys of sensor nodes with Key-chain technique. Third, it authenticates sensor node's ID using hash function. So, it maximizes sensor node's memory usage, reduces communication overhead. Finally it detects Sybil attack through ID-based certificate. Therefore, the proposed technique of Sybil attack detection using ID-based certificate consider simultaneously energy efficiency and stability on sensor network environment, and can trust the provided information through sensor network.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.599-603
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• 2006

유비쿼터스 센서 네트워크(Ubiquitous Sensor Network, USN)는 차세대 네트워크로 각광받고 있고 이러한 센서 네트워크의 보안에 대한 관심은 더욱 높아지고 있다. 왜냐하면 센서 네트워크를 외부 공격자로부터 보호하기 위해서는 센서 노드 사이의 암호화 통신과 인증 등이 필요하기 때문이다. 이를 위해서는 안전한 키 생성 및 폐기가 우선 이루어져야 한다. 지금까지 센서 네트워크를 위해 제안된 키 분배 프로토콜은 매우 다양하다. 그러나 이러한 프로토콜들이 기반하고 있는 가정들이 얼마나 안전하고 현실성 있는 지 분석되어 있지 않다. 키 분배의 대표적 프로토콜인 LEAP(Localized Encryption and Authentication Protocol)은 무선 센서 네트워크에 적합한 가정을 하였다고 알려져 있다. 본 논문에서는 이 LEAP 프로토콜을 USN 상에서 구현을 통해 이 가정의 현실성에 대해 분석해 볼 것이다. 이는 차후 다양한 키 분배 프로토콜을 연구 개발하는 데 있어서 상당한 도움이 될 거라 예상된다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.3 s.357
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• pp.65-71
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• 2007

We propose a pixel-level automatic calibration circuit scheme that initializes a capacitive fingerprint sensor LSI to eliminate the influence of the surface condition and environment, which is degraded by dirt during long-time use, process variation and ambient temperature. The sample chip is fabricated on $0.35{\mu}m$ standard CMOS process. The calibration is executed by optimizing the reference voltage in each pixel to make the sensor signals of all pixels the same. The calibration control circuit is composed of the sensing circuit and charge pumping circuit, and calibrates all pixels in a short time. 16-level gray scale fingerprint images can be captured to increase the accuracy of identification. This confirms that the scheme is effective for capturing consistent clear images during long-time use.

• Journal of the Korea Society for Simulation
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• v.18 no.3
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• pp.133-138
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• 2009

When sensor networks are deployed in open environments, an adversary may compromise some sensor nodes and use them to inject false sensing reports. False report attack can lead to not only false alarms but also the depletion of limited energy resources in battery powered networks. The Interleaved hop-by-hop authentication (IHA) scheme detects such false reports through interleaved authentication. In IHA, when a report is forwarded to the base station, all nodes on the path must spend energies on receiving, authenticating, and transmitting it. An dversary can spend energies in nodes by using the methods as a relaying attack which uses macro. The Adversary aim to drain the finite amount of energies in sensor nodes without sending false reports to BS, the result paralyzing sensor network. In this paper, we propose a countermeasure using fuzzy logic from the Denial of Service(DoS) attack and show an efficiency of energy through the simulataion result.