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Lecture notes in computer science

Affiliation-Hiding Key Exchange with Untrusted Group Authorities

Mark Manulis, Bertram Poettering, Gene Tsudik

Published Jan 1, 2010• 16 citations
Publisher
DOI
10.1007/978-3-642-13708-2_24

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Affiliation-Hiding Authenticated Asymmetric Group Key Agreement (AH-AAGKA) protocol can be utilized by the members of a group to authenticate each other secretly. The participants affiliated to the group can execute the AH-AAGKA protocol to establish a common encryption key. Any legitimate participant can compute its own decryption key corresponding to the encryption key. Particularly, every legitimate player's affiliation information is only revealed to other legitimate players. In this paper, we present a one-round AH-AAGKA protocol. Compared with previous work, in our protocol, Group Authority (GA) does not need to be fully trusted (we call it semi-trusted). Therefore, GA cannot impersonate any honest user to execute the protocol. Meanwhile, GA can trace group members through analyzing the communication flows. Our protocol holds the affiliation-hiding property and detectability. Additionally, our scheme exhibits Perfect Forward Secrecy for both GA and outside attackers.

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New construction of affiliation‐hiding authenticated group key agreement

Chang Liang Xu, Hua Guo, Zhoujun Li +1 more

ABSTRACT In CT‐RSA 2007, Jarecki, Kim, and Tsudik introduced the notion of affiliation‐hiding authenticated group key agreement (AH‐AGKA) protocols and presented two concrete AH‐AGKA protocols. In this paper, we will show that these protocols have some drawbacks. We will also introduce the notion of affiliation‐hiding authenticated asymmetric group key agreement (AH‐AAGKA) and present an AH‐AAGKA protocol. AH‐AAGKA protocols allow the participants of a group to establish a common encryption key associated with several decryption keys; each of which can only be computed by the corresponding legitimate participant. Meanwhile, any party is assured that its affiliation is revealed to the participants that belong to the same group only. Compared with previous AH‐AGKA protocols, if invalid players participate in our protocol, legitimate participants can identify these invalid players. In contrast to existing AH‐AGKA protocols, our protocol holds perfect forward secrecy, which is proven in a novel security model we proposed. Additionally, we present a new privacy model to prove that our protocol achieves linkable affiliation‐hiding property. Copyright © 2012 John Wiley & Sons, Ltd.

Security and Communication Networks•Aug 29, 2012•3 citations
Affiliation-Hiding Authenticated Asymmetric Group Key Agreement (AH-AAGKA) protocol can be utilized by the members of a group to authenticate each other secretly. The participants affiliated to the group can execute the AH-AAGKA protocol to establish a common encryption key. Any legitimate participant can compute its own decryption key corresponding to the encryption key. Particularly, every legitimate player's affiliation information is only revealed to other legitimate players. In this paper, we present a one-round AH-AAGKA protocol. Compared with previous work, in our protocol, Group Authority (GA) does not need to be fully trusted (we call it semi-trusted). Therefore, GA cannot impersonate any honest user to execute the protocol. Meanwhile, GA can trace group members through analyzing the communication flows. Our protocol holds the affiliation-hiding property and detectability. Additionally, our scheme exhibits Perfect Forward Secrecy for both GA and outside attackers.
The notion of Affiliation-Hiding Authenticated Group Key Agreement (AH-AGKA) protocols was first introduced by Jarecki et al. in CT-RSA 2007, where they presented two concrete AH-AGKA protocols. In this paper, we show that Jarecki et al.'s second protocol has some drawbacks. We propose a new affiliation-hiding protocol. Differing from Jarecki et al.'s protocol, our protocol is asymmetric. Compared with existing AH-AGKA protocols, our scheme not only exhibits the affiliation-hiding property, but also holds the properties of detectability and perfect forward secrecy.
ABSTRACT In CT‐RSA 2007, Jarecki, Kim, and Tsudik introduced the notion of affiliation‐hiding authenticated group key agreement (AH‐AGKA) protocols and presented two concrete AH‐AGKA protocols. In this paper, we will show that these protocols have some drawbacks. We will also introduce the notion of affiliation‐hiding authenticated asymmetric group key agreement (AH‐AAGKA) and present an AH‐AAGKA protocol. AH‐AAGKA protocols allow the participants of a group to establish a common encryption key associated with several decryption keys; each of which can only be computed by the corresponding legitimate participant. Meanwhile, any party is assured that its affiliation is revealed to the participants that belong to the same group only. Compared with previous AH‐AGKA protocols, if invalid players participate in our protocol, legitimate participants can identify these invalid players. In contrast to existing AH‐AGKA protocols, our protocol holds perfect forward secrecy, which is proven in a novel security model we proposed. Additionally, we present a new privacy model to prove that our protocol achieves linkable affiliation‐hiding property. Copyright © 2012 John Wiley & Sons, Ltd.