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上海交通大学学报：英文版

ID-Based Authenticated Dynamic Group Key Agreement

王莺洁, 潘军, 诸鸿文

Published Jan 1, 2005• 4 citations
OpenAlex

Abstract

Two ID-based authenticated group key agreement schemes, proposed by Choi et al and Du et al, are insecure against an impersonation attack and they only discussed the static group. This paper proposed a variant of BD protocol, which is fully authenticated by a proven-secure ID-based signature scheme. The protocol can resist the impersonation attack, and other security attributes are also satisfied. Compared with Choi et al and Du et al schemes, the proposed one is more efficient and applicable for dynamic groups.

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•Jan 1, 2005•57 citations
Two ID-based authenticated group key agreement schemes, proposed by Choi et al and Du et al, are insecure against an impersonation attack and they only discussed the static group. This paper proposed a variant of BD protocol, which is fully authenticated by a proven-secure ID-based signature scheme. The protocol can resist the impersonation attack, and other security attributes are also satisfied. Compared with Choi et al and Du et al schemes, the proposed one is more efficient and applicable for dynamic groups.
In 2004, Choi et al. proposed an ID-based authenticated group key agreement. Unfortunately, their protocol was found to be vulnerable to the insider attacks by Zhang, Chen and Shim. To prevent insider attacks, Shim presented a modification of Choi et al.'s protocol. In this letter, we first show that Shim's modification is still insecure against insider attacks. We then present a modification of Choi et al.'s protocol that resists insider attacks. The counter-measure uses an ID-based signature on transcripts in order to bind them in a session. This prevents any replay of transcripts. Especially, by applying ID-based batch verification, the proposed one still consists of two rounds and is computationally efficient.
Authenticated group key agreement allows a group of users to generate a shared key which satisfies various security requirements. Several identity-based authenticated group key agreement schemes are proposed. However, these schemes are shown to be vulnerable to insider impersonation attacks that any two malicious group members can impersonate other user to agree some session keys in a new group. In this paper, a simple two round authenticated group agreement scheme based on Burmester and Desmedt's scheme is proposed. Compared to previous protocols, our protocol is efficient while secure against various known attacks, including key exposure attacks and insider impersonation attacks.
Through the group key agreement, all group members could negotiate a common session key which is used in later secure communication.While simple GKA cannot provide enough security to resist the adversary's attack, and the malicious damage during the agreement makes the authenticated key agreement particularly important.In identity-based authentication, user's unique identity information is used as the public key, which makes it exempt from a series of management of the certification in public-key infrastructure.Thereby, the identity-based key agreement can simplify the key management procedures and reduce the risk of failure at the certification authority.Recently, several identity-based group key agreement protocols have been proposed, however most of them are either vulnerable to impersonation and replay attack or inefficient and unscalable.This paper proposes a novel authenticated group key agreement protocol which is based on bilinear pairings.It needs two rounds to negotiate the session key, and the low computational complexity makes the protocol efficient and scalable.Meanwhile, our protocol also ensures the forward and backward secrecy and the key independence.Under the Decisional Diffie-Hellman assumption, our protocol is proved to be secure against the adversary. 1.
Many conference systems over the Internet require authenticated group key agreement (AGKA) for secure and reliable communication. After Shamir [1] proposed the ID-based cryptosystem in 1984, ID-based AGKA protocols have been actively studied because of the simple public key management. In 2006, Zhou et al. [12] proposed two-round ID-based AGKA protocol which is very efficient in communication and computation complexity. However, their protocol does not provide user identification and suffers from the impersonation attack by malicious participants. In this paper, we propose improved ID-based AGKA protocol to prevent impersonation attack from Zhou et al.'s protocol. In our protocol, the malicious insider cannot impersonate another participants even if he knows the ephemeral group secret value. Moreover, our protocol reduces the computation cost from Zhou et al.'s protocol.
We analyse the existing ID-based authenticated key agreement protocols, and find out that several proposed protocols of this type do not satisfy related security attributes. This paper reviews Wang's, He's and Guo's protocols sequentially, and shows key compromise impersonation attack on Wang's scheme, ephemeral secrets reveal attack on He's scheme, key reveal attack and ephemeral secrets reveal attack on Guo's scheme, respectively, Finally, this paper proposes some improving suggestions on corresponding weaknesses of these protocols.