• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.6
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• pp.1368-1373
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• 2015

Recently, There is increasing interest in the IoT(Internet of Thing) as intelligent information service that enables communication between people and things based on internet. In particular the demand for indoor location-based services with the development of smart devices is rapidly increasing. Using the RSSI signal that is provide to the BLE(Bluetooth Low Energy) for Indoor location information measurement calculates distance information between beacon and mobile terminal. However, simply using the RSSI signal to the distance measurement has a difficult to get the indoor location information due to the influence of the signal interference and the weather. In this paper, by performing an operation for obtaining a reliable distance information from the signal information of iBeacon we propose a system for providing reliable indoor location.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.1
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• pp.1-8
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• 2018

While the number of passengers using urban railroads is increasing day by day, the number of complaints from passengers is also increasing. In order to resolve problems caused by poor communication between urban railroad officials and passengers in this paper. An IOS application using the Internet of Things (IoT) technology is proposed for providing safety and comfort temperature service(s) and for taking prompt action(s) of passengers complaints. In this proposal system, the temperature & humidity sensors were placed in a suitable location within the train. At the same time, transferring measurements to the remote server, allowing passengers to request their desired temperature through the IOS Application. Like this based on the collected data, I suggest a system that urban railroad officials can control temperature & humidity of the train. The proposed system was implemented by the Gwangju Metro Line 1 to validate its effectiveness.

• Journal of Information Processing Systems
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• v.17 no.4
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• pp.801-817
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• 2021

Network virtualization technologies have played efficient roles in deploying cloud, Internet of Things (IoT), big data, and 5G network. We have conducted a survey on network virtualization technologies, such as software-defined networking (SDN), network functions virtualization (NFV), and network virtualization overlay (NVO). For each of technologies, we have explained the comprehensive architectures, applied technologies, and the advantages and disadvantages. Furthermore, this paper has provided a summarized view of the latest research works on challenges and solutions of security issues mainly focused on DDoS attack and encryption.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.350-351
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• 2015

본 논문에서는 융합 기술의 발전으로 사물 인터넷을 매개체로 하여 기존의 통신망에서의 응용 기술들이 통합되어 발전되고 있다. 융합 기술로의 발전으로 인하여 기존의 통신망에서의 데이터 보호를 위한 기존의 정보보호 기술로는 사물 인터넷망의 데이터를 보호할 수 있다. 따라서 본 논문에서는 사물 인터넷망에서의 정보보호 기술의 동향 및 요구사항을 분석하여 융합 분야에서 필수적인 사항을 제안한다.

• Annual Conference of KIPS
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• 2021.11a
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• pp.907-909
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• 2021

반려동물을 효과적으로 보살필 수 있는 IoT(Internet of Things) 기반의 펫 웨어러블 디바이스가 연구 및 개발되고 있다. 본 논문에서는 펫 웨어러블 디바이스로부터 수집되는 데이터로부터 하루의 활동량을 파악하고자 데이터의 특징을 추출하고 GAT(Graph Attention Network)를 활용한 반려동물 행동 분류 기법을 제안한다. 이를 통하여 반려동물의 무기력증 등을 보호자에게 더욱 빠르게 알릴 수 있을 것으로 기대한다.

• Annual Conference of KIPS
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• 2017.04a
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• pp.471-472
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• 2017

사물인터넷은 각종 사물에게 통신 기능 및 센서 기능 장치를 부착하여 인터넷에 연결될 수 있게 하고 각 사물들 간에 통신을 가능하게 하는 기술을 의미한다. 미국의 국가정보위원회는 2025년까지 다양한 분야에서 국가경쟁력에 영향을 미칠 수 있는 6대 기술 중 하나로 사물인터넷을 꼽고 보안 대책을 마련하고 있다. 여러 분야에 걸쳐 있는 사물인터넷의 보안 대책 수립을 위해 각 분야별로 다른 접근법을 제시하는 것이 필요하다.

• Journal of Information Processing Systems
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• v.17 no.2
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• pp.253-270
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• 2021

In January 2013, the National Institute of Standards and Technology (NIST) announced the CAESAR (Competition for Authenticated Encryption: Security, Applicability, and Robustness) contest to identify authenticated ciphers that are suitable for a wide range of applications. A total of 57 submissions made it into the first round of the competition out of which 6 were announced as winners in March 2019. In the process of the competition, NIST realized that most of the authenticated ciphers submitted were not suitable for resource-constrained devices used as end nodes in the Internet-of-Things (IoT) platform. For that matter, the NIST Lightweight Cryptography Standardization Process was set up to identify authenticated encryption and hashing algorithms for IoT devices. The call for submissions was initiated in 2018 and in April 2019, 56 submissions made it into the first round of the competition. In August 2019, 32 out of the 56 submissions were selected for the second round which is due to end in the year 2021. This work surveys the 32 authenticated encryption schemes that made it into the second round of the NIST lightweight cryptography standardization process. The paper presents an easy-to-understand comparative overview of the recommended parameters, primitives, mode of operation, features, security parameter, and hardware/software performance of the 32 candidate algorithms. The paper goes further by discussing the challenges of the Lightweight Cryptography Standardization Process and provides some suitable recommendations.

• Review of KIISC
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• v.25 no.4
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• pp.11-17
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• 2015

사물인터넷(IoT, Internet of Things)의 발전과 스마트 기기의 보급으로 개인정보 등과 같은 중요한 정보를 빠르고 안전하게 암호화 및 전송할 필요가 생겼다. 사물인터넷과 같이 제한된 환경에서 암호화를 할 수 있도록 설계된 암호기술을 경량 암호기술이라 한다. 본 논문에서는 국제표준화기구/국제전기표준화위원회 합동기술위원회 1 연구그룹 27 작업그룹 2(ISO/IEC JTC 1/SC 27 WG2)에서 진행되고 있는 경량 암호기술의 표준화 동향을 중심으로 우리나라의 경량 암호기술과 함께 고찰하고자 한다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.1
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• pp.165-170
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• 2016

Recently, IoT(Internet of Things) technology is widely applied in not only our everyday lives but also in industry, medical field and security system. NFC system, the basis of IoT, is in the spotlight which can be an alternative solution of a anti-theft system for motorcycle as they basically have practicality and security issues. Anti-theft system for motorcycle using the NFC smart devices based on RFID has been proposed. because Progress of Smart Device If someone get the Key for motorcycle theft, he can be easily stolen motorcycle. We thought about the concept of NFC security devices as a wireless key and automatic solenoid valve for setting the lock and unlock module. In this study, we designed motorcycle smart key system with general-purpose NFC system and the automatic solenoid valve for setting the lock and unlock module. First, we designed control unit and NFC card reader for motorcycle smart key system. Then we propose an AES encryption algorithm and prove that the motorcycle key system is controllable by showing the result of implementing and testing, after installing.

• Journal of Sensor Science and Technology
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• v.27 no.1
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• pp.59-63
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• 2018

Among Internet of things (IoT) applications, the most demanding requirements for the widespread realization of many IoT visions are security and low power. In terms of security, IoT applications include tasks that are rarely addressed before such as secure computation, trusted sensing, and communication, privacy, and so on. These tasks ask for new and better techniques for the protection of data, software, and hardware. An integral part of hardware cryptographic primitives are secret keys and unique IDs. Physical Unclonable Functions(PUF) are a unique class of circuits that leverage the inherent variations in manufacturing process to create unique, unclonable IDs and secret keys. In this paper, we propose a low power Arbiter PUF circuit with low error rate and high reliability compared with conventional arbiter PUFs. The proposed PUF utilizes a power gating structure to save the power consumption in sleep mode, and uses a razor flip-flop to increase reliability. PUF has been designed and implemented using a FPGA and a ASIC chip (a 0.35 um technology). Experimental results show that our proposed PUF solves the metastability problem and reduce the power consumption of PUF compared to the conventional Arbiter PUF. It is expected that the proposed PUF can be used in systems required low power consumption and high reliability such as low power encryption processors and low power biomedical systems.