• Title, Summary, Keyword: Conference Key

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Efficient Fault-Tolerant Conference-Key Agreement using ID-based One Round Tripartite Key Agreement Protocol (아이디 기반의 일 라운드 삼자 간 키 합의 프로토콜을 이용한 효율적인 결함 허용 회의 키 합의 방법)

  • Lee, Sang-Ho;Kim, Jong;Hong, Sung-Je
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.5
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    • pp.512-516
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    • 2008
  • A conference-key agreement protocol is essential for computer network conferences that need secure communications. Especially, the fault-tolerant conference-key agreement can make a shared conference-key even if some make conferees disturb the key agreement processes. However, the performance of the previous fault-tolerant conference-key agreement protocols is decreasing significantly when the number of fake conferees is increasing. In this paper, we propose an efficient fault-tolerant conference key agreement protocol. Our scheme is based on the ID-based one round tripartite conference key agreement protocol. Simulation results show our scheme's efficiency against Yi's method especially when the number of fake conferees is large.

The Smart Contract based Conference Key Distribution Scheme (스마트계약 기반 회의용 키 분배 기법)

  • Yun, Sunghyun
    • Journal of The Korea Internet of Things Society
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    • v.6 no.4
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    • pp.1-6
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    • 2020
  • Recently, epidemic of covid-19 causes rapid increase in demand for untact video conferences. In existing server-client based video conference systems such as Zoom, Google Meet, etc., the server generates the conference key and controls the access rights of meeting members and their contents with it. In this case, the server can fabricate or repudiate the meeting. So, the privacy of the meeting members is not guaranteed. It's necessary to make the conference key distribution scheme where all participants can verify the trustfulness without help of the server. The smart contract is the program stored to the blockchain. Its contents cannot be altered due to the property of the blockchain, and everybody can verify the execution results of it. In this study, we propose the smart contract based conference key distribution scheme. The proposed scheme is consisted of smart contract deployment, conference key generation and verification stages. The smart contract replaces the role of existing trustful server and the meeting members can generate the conference key according to the protocols implemented on it. The proposed scheme can be applied to the video conference systems and only the meeting members can access the conference key.

Identity-Based Key Agreement Protocol Employing a Symmetric Balanced Incomplete Block Design

  • Shen, Jian;Moh, Sangman;Chung, Ilyong
    • Journal of Communications and Networks
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    • v.14 no.6
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    • pp.682-691
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    • 2012
  • Key agreement protocol is a fundamental protocol in cryptography whereby two or more participants can agree on a common conference key in order to communicate securely among themselves. In this situation, the participants can securely send and receive messages with each other. An adversary not having access to the conference key will not be able to decrypt the messages. In this paper, we propose a novel identity-based authenticated multi user key agreement protocol employing a symmetric balanced incomplete block design. Our protocol is built on elliptic curve cryptography and takes advantage of a kind of bilinear map called Weil pairing. The protocol presented can provide an identification (ID)-based authentication service and resist different key attacks. Furthermore, our protocol is efficient and needs only two rounds for generating a common conference key. It is worth noting that the communication cost for generating a conference key in our protocol is only O($\sqrt{n}$) and the computation cost is only O($nm^2$), where $n$ implies the number of participants and m denotes the extension degree of the finite field $F_{p^m}$. In addition, in order to resist the different key attack from malicious participants, our protocol can be further extended to provide the fault tolerant property.

The Analysis of New Video Conference System Based Secure Authentication

  • Jung Yong Deug;Kim Gil Choon;Jun Moon Seog
    • Proceedings of the IEEK Conference
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    • pp.600-607
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    • 2004
  • The paper describes the implementation of the video conferencing system using public key infrastructure which is used for user authentication and media stream encryption. Using public key infrastructure, we are able to reinforce the authentication for conference participant and block several malicious hacking while protecting conference control information. The paper shows the implementation of the transportation layer secure protocol in conformity with Korea public key authentication algorithm standard and symmetric key encryption algorithm (RC2, SEED, DES and 3DES) for media stream encryption. The feature of the paper is transportation layer secure protocol that is implemented for protection of information on a user authentication and video conference and the media streaming encryption algorithm also can be envisioned with another block encryption algorithm. The key for media streaming encryption may be safely distributed by the transportation layer secure protocol.

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Design and Implementation of Public key-based Video Conference System for Authentication and Encryption (공개키기반 사용자인증과 암호화를 적용한 영상회의 시스템 설계 및 구현)

  • Jung Yong-Deug;Lee Sang-Hun;Jin Moon-Seog
    • The KIPS Transactions:PartC
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    • v.11C no.7
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    • pp.971-980
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    • 2004
  • This paper describes the design and implementation of the video conferencing system using public key infrastructure which is used for user authentication and encryption. Public key infrastructure reinforces the authentication process for conference participant, and the symmetric key system blocks malicious access to information and protect conference control information. This paper shows the implementation of the trans portation layer secure protocol in conformity with Korea public key authentication algorithm standard and symmetric encryption algorithm (DES, 3DES and AES) for media stream encryption. In this paper, we deal with two ways of protecting information : transportation layer secure protocol secures user authentication process and the conference control information; while public key-based authentication system protects personal information of users when they connect to the network. When distributing the session keys for encryption, Internet Key Exchange is used for P2P communication, and secure protocol is employed for 1 : N multi-user communication in the way of distributing the public key-based en-cryption key.

The Design of Conference-based Authentication Mechanism Employing the Symmetric Balanced Incomplete Block Design on IMT-2000 Environment (IMT-2000환경에서 Symmetric Balanced Incomplete Block Design을 응용한 회의용 인증메커니즘의 설계)

  • 배용근;정일용
    • Journal of Korea Multimedia Society
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    • v.6 no.7
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    • pp.1277-1285
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    • 2003
  • In this paper, we present a conference key authentication mechanism by employing an algebraic method on IMT-2000 environment. To accomplish this, the symmetric balanced incomplete block design is applied for generating a conference key and then this key is distributed to participants. Through the technique for creation of a conference key and mutual authentications peformed based on identification information, a communication protocol is designed. The protocol proposed minimizes the communication complexity for generating a conference key. On a special case the complexity is O(equation omitted), where v is the number of participants. The security of the mechanism, which is a significant problem in construction of secure systems, can be assured since finding discrete logarithms is generally a hard problem.

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