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International Conference on Computer Sciences and Convergence Information Technology

A Collaborative Conference Key Agreement Scheme by Using an Intermediary Node

Chin‐Chen Chang, Hao-Chuan Tsai, Pen-Yi Chang Lijun Chu, Xuefeng Zheng, Shaojie Wang

Published Nov 1, 2007• 8 citations
Publisher

Abstract

Conference key agreement is one of the important issues in cryptography. In this paper, we propose a novel conference key agreement scheme. Without adopting the authenticated broadcasting channel model, we use an intermediary node to ensure the correctness of the transmitted messages. A passive adversary or an active adversary obtains zero knowledge about the common conference key established by the all honest participants who follow the proposed scheme. Keywords: conference key, Diffie-Hellman, passive adversary, active adversary, cryptography

DOI
10.1109/iccit.2007.53

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Conference key agreement is one of the important issues in cryptography. In this paper, we propose a novel conference key agreement scheme. Without adopting the authenticated broadcasting channel model, we use an intermediary node to ensure the correctness of the transmitted messages. A passive adversary or an active adversary obtains zero knowledge about the common conference key established by the all honest participants who follow the proposed scheme. Keywords: conference key, Diffie-Hellman, passive adversary, active adversary, cryptography
When a group of people want to communicate securely over an open network, they run a conference-key protocol to establish a common conference key K such that all their communications thereafter are encrypted with the key K. In this paper, we propose a provably secure fault-tolerant conference-key agreement protocol under the authenticated broadcast channel model. We show that a passive adversary gets zero knowledge about the conference key established by the honest participants under the assumption of a variant Diffie-Hellman (1976) decision problem. We also show that the honest participants can agree on a common conference key no matter how many participants are malicious. Furthermore, we show that even if the broadcast channel is not authenticated, our protocol is secure against impersonators under the random oracle model.
Most of conference key agreement algorithms operate only when all participants are honest,but do not work when some participants are malicious and attempt to delay or destruct the conference.This paper presents a new conference key agreement algorithm based on the identity-based signature scheme given by Cha and Cheon.Under the Gap Diffie-Hellman assumption,honest participants can agree on a common conference key no matter how many participants are malicious,and passive adversaries get no information about the conference key established by honest participants.Furthermore,the algorithm is efficient,and has flexible structure and high adaptability.
A computationally secure and robust conference key distribution scheme is presented, which requires only the authenticated and encrypted point-to-point channels between each server and each user. By using it, every honest user of a conference can get a common key after running of the protocol, even if some minority of the servers malfunction or misbehave. Analysis shows that a passive adversary gets zero knowledge about the conference key, and the active adversary cannot impersonate successfully. Because this scheme is noninteractive, both operation and communication overhead are reduced, this make it very efficient.
This paper proposes a computationally secure and fault-tolerant conference key distribution scheme, which only requires the authenticated and encrypted point-to-point channels between each server and each user. By the combined use of knowledge proof and verifiable secret sharing, the scheme has the properties of simple structure and high security. Analysis shows that every honest user of a conference can get a common key after the running of the protocol, even if a minority of the servers malfunction or misbehave. We also show that on the assumption of a Diffie-Hellman decisional problem, a passive adversary gets zero knowledge about the conference key, and the active adversary cannot impersonate someone successfully. Because the knowledge proof method we adopt is non-interactive, both operation and communication overheads are reduced, thus making the schemes very efficient.
Byzantine fault model will be increasingly important in the future because malicious attacks and component failures are increasingly common and can cause faulty nodes to exhibit arbitrary behavior. This paper describes an efficient fault-tolerant conference-key agreement schme based on this model under the authenticated channel model. For distributing conference keys, the scheme based on commit-challenge-response framework requires only 2t+1 active servers. So it is efficient and optimal. It is shown that the passive or active adversaries neither gain information about the conference keys established by the honest participants nor disrupt conference keys establishment.