Reducing risks from poorly chosen keys
SOSP '89 Proceedings of the twelfth ACM symposium on Operating systems principles
Provably authenticated group Diffie-Hellman key exchange
CCS '01 Proceedings of the 8th ACM conference on Computer and Communications Security
Securing passwords against dictionary attacks
Proceedings of the 9th ACM conference on Computer and communications security
Open Problems in Data-Sharing Peer-to-Peer Systems
ICDT '03 Proceedings of the 9th International Conference on Database Theory
Non-Interactive Zero-Knowledge Proof of Knowledge and Chosen Ciphertext Attack
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Group Diffie-Hellman Key Exchange Secure against Dictionary Attacks
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Transitive Signatures Based on Factoring and RSA
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
N-Party encrypted diffie-hellman key exchange using different passwords
ACNS'05 Proceedings of the Third international conference on Applied Cryptography and Network Security
Password-Based group key exchange in a constant number of rounds
PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
Secure content access and replication in pure P2P networks
Computer Communications
nPAKE+: a tree-based group password-authenticated key exchange protocol using different passwords
Journal of Computer Science and Technology
Enhancing Security of a Group Key Exchange Protocol for Users with Individual Passwords
ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part II
(Password) authenticated key establishment: from 2-party to group
TCC'07 Proceedings of the 4th conference on Theory of cryptography
nPAKE+: a hierarchical group password-authenticated key exchange protocol using different passwords
ICICS'07 Proceedings of the 9th international conference on Information and communications security
Password-based tripartite key exchange protocol with forward secrecy
RSKT'08 Proceedings of the 3rd international conference on Rough sets and knowledge technology
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We explore authenticated group key agreement in data-sharing Peer-to-Peer networks. We first propose a novel password-based authenticated group key agreement protocol with key confirmation. We present a formal statement of its security in a variant of the Bresson et al. security model adapted for the password-based setting. A discussion of the limitations of our protocol in the case where the group size becomes large is then presented. We conclude the paper with an enhanced version of the protocol, using a CAPTCHA technique, designed to make it more robust against online password guessing attacks.