Provably authenticated group Diffie-Hellman key exchange
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
Analysis of Key-Exchange Protocols and Their Use for Building Secure Channels
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
Dynamic Group Diffie-Hellman Key Exchange under Standard Assumptions
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
Provably Authenticated Group Diffie-Hellman Key Exchange - The Dynamic Case
ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Key Agreement Protocols and Their Security Analysis
Proceedings of the 6th IMA International Conference on Cryptography and Coding
Round-Optimal Contributory Conference Key Agreement
PKC '03 Proceedings of the 6th International Workshop on Theory and Practice in Public Key Cryptography: Public Key Cryptography
Modeling insider attacks on group key-exchange protocols
Proceedings of the 12th ACM conference on Computer and communications security
Secure group key establishment revisited
International Journal of Information Security
Securing group key exchange against strong corruptions
Proceedings of the 2008 ACM symposium on Information, computer and communications security
Efficient and Strongly Secure Password-Based Server Aided Key Exchange (Extended Abstract)
INDOCRYPT '08 Proceedings of the 9th International Conference on Cryptology in India: Progress in Cryptology
Modeling Key Compromise Impersonation Attacks on Group Key Exchange Protocols
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
Stronger security of authenticated key exchange
ProvSec'07 Proceedings of the 1st international conference on Provable security
Modeling leakage of ephemeral secrets in tripartite/group key exchange
ICISC'09 Proceedings of the 12th international conference on Information security and cryptology
INDOCRYPT'06 Proceedings of the 7th international conference on Cryptology in India
Password-Based authenticated key exchange in the three-party setting
PKC'05 Proceedings of the 8th international conference on Theory and Practice in Public Key Cryptography
Sufficient condition for ephemeral key-leakage resilient tripartite key exchange
ACISP'12 Proceedings of the 17th Australasian conference on Information Security and Privacy
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In PKC 2009, Gorantla, Boyd and González Nieto presented a nice result on modelling security for group key agreement (GKA) protocols. They proposed a novel security model (GBG model) that better supports the adversaries' queries than previous models for GKA protocols by considering KCI resilience. However, ephemeral key leakage attack resistance has been left outside the scope of the GBG model. In this paper, we demonstrate an ephemeral key leakage on an existing GKA protocol which has been shown secure in the GBG model. We then extend the GBG model by allowing the adversary greater attack powers of leaking ephemeral keys in GKA protocol session. We also apply the well known NAX-OS trick to propose an improvement to an existing GKA protocol, which can resist the ephemeral key leakage attack. The security of the improved protocol has been argued under the our new model.