• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.7C
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• pp.1015-1023
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• 2004

In order to protect an exchanged data, it is indispensable to establish a peer-to-peer key between the two communicating nodes. Pre-distributing keys among the nodes is unrealistic in Ad-Hoc network environment because of the dynamic nature of its network topology and the equal authority of its nodes. This paper presents a peer-to-peer key establishment scheme without pre-distributing keys in Ad-Hoc networks. The proposed scheme is based on the Diffie-Hellman key exchange protocol. Main idea is to prevent the falsification of Diffe-Hellman values using some elements of a hash chain. As a result, it is as safe as the underlying hash function against a man-in-the-middle attack. Simulation results have shown that the proposed scheme dramatically reduces the number of messages, and has relatively higher scalability, as compared with the key pre-distribution based scheme.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.3
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• pp.534-539
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• 2005

The key in wireless sensor networks, which consist of a number of sensor nodes, is an energy efficiency. Many routing protocols have been proposed for prolonging network lifetime and reducing traffic in wireless sensor networks. Wireless sensor networks usually use wireless ad-hoc network protocols for routing, but these protocols are not well-suited for wireless sensor networks due to many reasons. In this paper, RM-flooding protocol is proposed for reducing routing overhead occurred when packet flooding. The nodes using this routing protocol can consume the limited energy effectively, and exchange information with remote nodes usulg information receiving from multipath. So, RM-flooding prolongs the network's lifetime.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.3
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• pp.103-118
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• 2002

To provide the privacy of transmitted message over network the use of cryptographic system is increasing gradually. Because the security and reliability of the cryptographic system is totally rely on the key, the key management is the most important part of the cryptographic system. Although there are a lot of security products providing encryption, the security of the key exchange protocols used in the product are not mostly proved yet. Therefore, we have to study properties and operation of key agreement protocols based on elliptic curve in ANSI X9.63. furthermore, we analyze the security of their protocols under passive and active attacker models and propose the most suitable application field taking the feature of the protocols into account.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.5
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• pp.21-30
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• 2005

Recently, a mobile IPv6 binding update protocol using Address Based Keys (BU-ABK) was proposed. This protocol applies Address Based Keys (ABK), generated through identity-based cryptosystem, to enable strong authentication and secure key exchange without any global security infrastructure. However, because it cannot detect that public cryptographic parameters for ABKs are altered or forged, it is vulnerable to man-in-the-middle attacks and denial of service attacks. Furthermore, it has heavy burden of managing the public cryptographic parameters. In this paper, we show the weaknesses of BU-ABK and then propose an enhanced BU-ABK (EBU-ABK). Furthermore, we provide an optimization for mobile devices with constraint computational power. The comparison of EBU-ABK with BU-ABK shows that the enhanced protocol achieves strong security while not resulting in heavy computation overhead on a mobile node.

• Journal of Korea Society of Industrial Information Systems
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• v.12 no.1
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• pp.28-38
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• 2007

In this paper, we implement Microsoft COM software modules for elliptic curve cryptographic applications and analyze its performance. The implemented COM software modules support all elliptic curve key exchange protocols and elliptic curve digital signature algorithm in IEEE 1363 finite fields GF(p) and GF(2m). Since the implemented software modules intend to focus on a component-based software development method, and thus it have a higher productivity and take systematic characteristics to be open outward and to be standardized. Accordingly, it enable a software to be developed easier and faster rather than a method using C library. In addition it support the Microsoft COM interface, we can easily implement secure software applications based on elliptic curve cryptographic algorithms.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.6
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• pp.1247-1260
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• 2021

For more efficient energy management of nodes in wireless sensor networks, research has been conducted on mobile sink nodes that deliver data from sensor nodes to server recently. UAV (Unmanned Aerial vehicle) is used as a representative mobile sink node. Also, most studies on UAV propose algorithms for calculating optimal paths and have produced rapid advances in the IoD (Internet of Drones) environment. At the same time, some papers proposed mutual authentication and secure key exchange considering nature of the IoD, which requires efficient creation of multiple nodes and session keys in security perspective. However, most papers that proposed secure communication in mobile sink nodes did not protect end-to-end data privacy. Therefore, in this paper, we propose integrated security model that authentication between mobile sink nodes and sensor nodes to securely relay sensor data to base stations. Also, we show informal security analysis that our scheme is secure from various known attacks. Finally, we compare communication overhead with other key exchange schemes previously proposed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7541-7548
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• 2015

Wireless Sensor Networks is the technology which is used in explore role for military purposes, as well as various fields such as industrial equipment management, process management, and leverage available technologies by distributing node into various areas. but there are some limitations about energy, processing power, and memory storage capacity in wireless sensor networks environment, because of tiny hardware, so various routing protocols are proposed to overcome it. however existing routing protocols are very vulnerable in the intercommunication, because they focus on energy efficiency, and they can't use existing encryption for it, Because of sensor's limitations such like processing power and memory. Therefore, this paper propose mutual authentication scheme that prevent various security threats by using mutual authentication techniques and, Key generation and updating system as taking into account energy efficiency.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.49-51
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• 2005

유비쿼터스 사회를 만들기 위한 핵심 기술인 RFID는 시간과 공간을 초월하여 우리에게 정보를 제공해 줄 것으로 기대되고 있지만, RFID 시스템이 가지고 있는 특성으로 인하여 프라이버시를 침해할 수 있다는 심각한 문제를 안고 있다 이를 해결하기 위한 방법으로 다양한 연구가 진행되어 왔지만 기존의 연구들은 보안상 문제점과 태그 및 백 엔드 데이터베이스의 과도한 처리능력을 요구하고 있다. 그러나 본 논문에서 제안하는 프로토콜은 해쉬함수와 XOR연산, 키 교환을 이용하여 스푸핑이나, 재전송 공격으로부터 안전 하면서도, 백 엔드 데이터베이스 안에서의 비교연산 횟수를 줄일 수 있는 경량화된 프로토콜을 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2007.02a
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• pp.105-107
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• 2007

최근에 제안되고 있는 원격 서버에 로그인하기 위한 방법은E와 패스워드뿐만 아니라 스마트카드를 함께 사용한다. 기존의 ID 와 패스워드를 사용한 인증은 공격자에 의해 추측이 가능하므로 사용자 가장 공격이 가능하다는 약점을 가지고 있다. 하지만 스마트카드와 ID, 패스워드를 사용하면 ID와 패스워드가 추측가능할지라도 스마트카드를 소지하고 있지 않다면 사용자 가장 공격 (impersonate attack)을 할 수 없다. 이 논문에서는 스마트카드와 ID, 패스워드를 함께 사용하여 원격 서버에 인증과 더불어 안전한 키 교환을 하며, 기존에 다른 논문들에서 언급한 조건들을 모두 만족하면서 안전한 키 교환까지 제안하였다. 기존의 스킴은 해쉬 기반으로 제안 되었으나 이 논문에서 제안한 스킴은 페어링 (pairing) 연산을 기반으로 제안 되었다. 또한, Computational Diffie-Hellman문제를 기반으로 스킴을 제안하여 안전성에 대한 증명이 가능하다 최근에 스마트카드를 사용한 인증에서 요구 되는 성질의 모든 조건을 만족한다는 장점을 가지고 있다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.207-212
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• 2006

Signcryption은 공개키 암호와 디지털 서명을 결합한 하이브리드 공개키 프리미티브이다. Signcryption은 디지털 서명 수행 후 암호화 과정을 수행하는 프로토콜보다 연산량과 통신량에서 월등한 우월성을 보여준다. 그러나 Signcryption 기법을 이용한 상호 인증 및 키 교환 프로토콜은 적용시스템(예를 들어 모바일 네트워크)에 따라 많은 연산량과 통신량(상대적으로 모바일과 무선 네트워크에 대해)이 부담이 된다. 이에 이동망과 모선 네트워크에 적합한 적은 연산량과 통신량의 특성을 가진 상호 인증 및 키 교환 프로토콜을 제안한다. 본 논문에서는 두 참여자 사이에서 참여자의 상호 인증과 안전한 통신을 위해 Signcryption을 이용한 EC 기반의 안전한 인증된 키 교환 프로토콜을 제안한다. 그리고 제안 프로토콜의 보안성을 증명하고 효율성을 비교한다.