• International Journal of Computer Science & Network Security
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• v.21 no.9
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• pp.1-10
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• 2021

The Internet of things (IoT) is the main advancement in data processing and communication technologies. In IoT, intelligent devices play an exciting role in wireless communication. Although, sensor nodes are low-cost devices for communication and data gathering. However, sensor nodes are more vulnerable to different security threats because these nodes have continuous access to the internet. Therefore, the multiparty security credential-based key generation mechanism provides effective security against several attacks. The key generation-based methods are implemented at sensor nodes, edge nodes, and also at server nodes for secure communication. The main challenging issue in a collaborative key generation scheme is the extensive multiplication. When the number of parties increased the multiplications are more complex. Thus, the computational cost of batch key and multiparty key-based schemes is high. This paper presents a Secure Multipart Key Distribution scheme (SMKD) that provides secure communication among the nodes by generating a multiparty secure key for communication. In this paper, we provide node authentication and session key generation mechanism among mobile nodes, head nodes, and trusted servers. We analyzed the achievements of the SMKD scheme against SPPDA, PPDAS, and PFDA schemes. Thus, the simulation environment is established by employing an NS 2. Simulation results prove that the performance of SMKD is better in terms of communication cost, computational cost, and energy consumption.

• Communications of the Korean Mathematical Society
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• v.18 no.1
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• pp.169-179
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• 2003

In this paper, we propose multiparty key agreement protocols by generalizing the Blom's scheme based on 2 variable polynomials. Especially we develop three party and four party key agreement schemes with security. The advantage of the new schemes is to have small demands on storage space.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.3
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• pp.1144-1156
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• 2014

In Internet, IP multicast has been used successfully to provide an efficient, best-effort delivery service for group communication applications. However, applications such as multiparty private conference, distribution of stock market information, pay per view and other subscriber services may require secure multicast to protect integrity and confidentiality of the group traffic, and validate message authenticity. Providing secure multicast for group communication is problematic without a robust group key management. In this paper, we propose a group key management scheme based on the secret sharing technology to require each member by itself to generate the group key when receiving a rekeying message multicast by the group key distributor. The proposed scheme enforces mutual authentication between a member and the group key distributor while executing the rekeying process, and provides forward secrecy and backward secrecy properties, and resists replay attack, impersonating attack, group key disclosing attack and malicious insider attack.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.2
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• pp.498-514
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• 2012

Machine to machine (M2M) communications is the hottest issue in the standardization and industry area, it is also defined as machine-type communication (MTC) in release 10 of the 3rd Generation Partnership Project (3GPP). Recently, most research have focused on congestion control, sensing, computing, and controlling technologies and resource management etc., but there are few studies on security aspects. In this paper, we first introduce the threats that exist in M2M system and corresponding solutions according to 3GPP. In addition, we present several new security issues including group access authentication, multiparty authentication and data authentication, and propose corresponding solutions through modifying existing authentication protocols and cryptographic algorithms, such as group authentication and key agreement protocol used to solve group access authentication of M2M, proxy signature for M2M system to tackle authentication issue among multiple entities and aggregate signature used to resolve security of small data transmission in M2M communications.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.500-506
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• 1998

This paper proposes an extension scheme of the well-known Berkeley Socket Interface for supporting QoS-provided multipeer multimedia communications. The current BSD Socket Interface has been TCP/IP-centric historically and the protocol suite was developed for the peer-to-peer best effort data communications. In order to support multiparty multimedia applications, such key functions as group management, QoS control, and reliable multicast transport should be exploited in the current simple unicast communication architecture and the well-known interface should be extended to cover the functions. This paper proposes a few new API functions and some changes in the current APIs.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1752-1755
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• 2002

The world wide web (WWW) already accounts f3r more Internee network traffic than any other application, including il and simple file transfer. It is also a collaborative technology in a weak sense of the word - it allows people to share information. Synchronous collaboration is where an interactive activity is simultaneous and in teal-time. Computer based real time collaborative systems like shared whiteboards. collaborative editor etc. are only beginning to emerge recently. These applications invoking more than two users exchanging information, require Multicast communication. Multicast communication is a transmission mode that is now supported by a variety of local and wide area networks. Multicasting enables multiparty communication across a wide area to sparsely distributed groups by minimizing the network load. Multicasting itself is one of the key technologies in the nut generation of the Internet This paper describes the technical issues from the aspect of multicast communication and its reliability in synchronous collaborative application.

• Journal of the Korea Society of Computer and Information
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• v.14 no.6
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• pp.51-57
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• 2009

Wireless sensor networks consist of numerous sensor nodes that have inexpensive and limited resources. Generally, most of the sensors are assigned to the hazardous or uncontrollable environments. If the sensor nodes are randomly assigned to the wide target area, it is very hard to see the accurate locations of sensor nodes. Therefore, this study provides an efficient key distribution scheme to solve these problems. Based on the provided scheme, the study enabled the closely neighboring nodes to exchange information with each other after securing safe links by using the pre-distributed keys. At the same time, the provided scheme could increase the probability of multiparty key detection among nodes by using the location information of sensor node. Lastly, the study intended to show the superiority of the limitation method through a performance test.

• Annual Conference on Human and Language Technology
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• 2018.10a
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• pp.215-219
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• 2018

다중 화자 대화 속 인물 식별이란 여러 등장인물이 나오는 대본에서 '그녀', '아버지' 등 인물을 지칭하는 명사 또는 명사구가 실제 어떤 인물을 나타내는지 파악하는 문제이다. 대본 자연어 데이터만을 입력으로 하는 대화 속 인물 식별 문제는 드라마 대본에 대해서 데이터가 구축 되었고 이를 기반으로 여러 연구가 진행되었다. 그러나, 사람도 다중 화자 대화의 문장만 보고는 인물을 지칭하는 명사 또는 명사구가 실제 어떤 인물인지 파악하기 어려운 경우가 있다. 이에 본 논문에서는 발화가 되는 시점의 영상 장면 정보를 추가적으로 활용하여 인물 식별의 성능을 높이는 방법을 제시한다. 또한 기존 대화 속 인물 식별 연구들은 미리 정의된 인물을 대상으로 분류하는 형태로 접근해왔다. 이는 학습에 사용되지 않았던 인물이 나오는 임의의 다른 드라마 대본이나 대화 등에 바로 적용될 수 없다. 이에 본 논문에서는 영상 정보는 활용하되, 한번 학습하면 임의의 대본에 적용될 수 있도록 사전 인물 정보를 사용하지 않는 상호참조해결 기반의 인물 식별 방법도 제시한다.