Limits on the security of coin flips when half the processors are faulty
STOC '86 Proceedings of the eighteenth annual ACM symposium on Theory of computing
Entity authentication and key distribution
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Provably authenticated group Diffie-Hellman key exchange
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
Universally composable two-party and multi-party secure computation
STOC '02 Proceedings of the thiry-fourth annual ACM symposium on Theory of computing
Security Analysis of IKE's Signature-Based Key-Exchange Protocol
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Universally Composable Notions of Key Exchange and Secure Channels
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications 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
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
Authenticated key exchange secure against dictionary attacks
EUROCRYPT'00 Proceedings of the 19th international conference on Theory and application of cryptographic techniques
Efficient two-party password-based key exchange protocols in the UC framework
CT-RSA'08 Proceedings of the 2008 The Cryptopgraphers' Track at the RSA conference on Topics in cryptology
A non-malleable group key exchange protocol robust against active insiders
ISC'06 Proceedings of the 9th international conference on Information Security
Provably Secure Constant Round Contributory Group Key Agreement in Dynamic Setting
IEEE Transactions on Information Theory
Modeling leakage of ephemeral secrets in tripartite/group key exchange
ICISC'09 Proceedings of the 12th international conference on Information security and cryptology
On the minimum communication effort for secure group key exchange
SAC'10 Proceedings of the 17th international conference on Selected areas in cryptography
Contributory password-authenticated group key exchange with join capability
CT-RSA'11 Proceedings of the 11th international conference on Topics in cryptology: CT-RSA 2011
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We treat the security of group key exchange (GKE) in the universal composability (UC) framework. Analyzing GKE protocols in the UC framework naturally addresses attacks by malicious insiders. We define an ideal functionality for GKE that captures contributiveness in addition to other desired security goals. We show that an efficient two-round protocol securely realizes the proposed functionality in the random oracle model. As a result, we obtain the most efficient UC-secure contributory GKE protocol known.